diff --git a/src/article/embeddedimage.cpp b/src/article/embeddedimage.cpp
index 5184fc904..99b47be54 100644
--- a/src/article/embeddedimage.cpp
+++ b/src/article/embeddedimage.cpp
@@ -17,6 +17,8 @@
 #include "message/messageadmin.h"
 
 #include <mutex>
+#include <system_error>
+
 
 //
 // スレッドのランチャ
@@ -24,7 +26,7 @@
 static std::mutex eimg_launcher_mutex;
 int redraw_counter = 0; // 0 になったとき再描画する
 
-void* eimg_launcher( void* dat )
+static void eimg_launcher( ARTICLE::EmbeddedImage* eimg )
 {
     ++redraw_counter;
 
@@ -36,7 +38,6 @@ void* eimg_launcher( void* dat )
     std::cout << "start eimg_launcher" << std::endl;
 #endif
 
-    ARTICLE::EmbeddedImage* eimg = (ARTICLE::EmbeddedImage* )( dat );
     eimg->resize_thread();
 
     // 再描画
@@ -49,8 +50,6 @@ void* eimg_launcher( void* dat )
 #ifdef _DEBUG
     std::cout << "end" << std::endl;
 #endif
-
-    return nullptr;
 }
 
 
@@ -78,6 +77,7 @@ EmbeddedImage::~EmbeddedImage()
     set_dispatchable( false );
 
     stop();
+    // m_thread.joinable() == true のときスレッドを破棄すると強制終了するため待機処理を入れる
     wait();
 }
 
@@ -98,7 +98,7 @@ void EmbeddedImage::wait()
 #ifdef _DEBUG    
     std::cout << "EmbeddedImage::wait" << std::endl;
 #endif 
-    m_thread.join();
+    if( m_thread.joinable() ) m_thread.join();
 }
 
 
@@ -108,7 +108,7 @@ void EmbeddedImage::show()
     std::cout << "EmbeddedImage::show url = " << m_url << std::endl;
 #endif
 
-    if( m_thread.is_running() ) return;
+    if( m_thread.joinable() ) return;
 
     // 画像読み込み
     if( ! m_img->is_cached() ) return;
@@ -119,7 +119,10 @@ void EmbeddedImage::show()
     if( ! width || ! height ) return;
 
     // スレッド起動して縮小
-    if( ! m_thread.create( eimg_launcher, ( void* )this, JDLIB::NODETACH ) ){
+    try {
+        m_thread = std::thread( eimg_launcher, this );
+    }
+    catch( std::system_error& ) {
         MISC::ERRMSG( "EmbeddedImage::show : could not start thread" );
     }
 }
diff --git a/src/article/embeddedimage.h b/src/article/embeddedimage.h
index b0b3664bc..dfa13e7d9 100644
--- a/src/article/embeddedimage.h
+++ b/src/article/embeddedimage.h
@@ -10,9 +10,11 @@
 
 #include "skeleton/dispatchable.h"
 
-#include "jdlib/jdthread.h"
 #include "jdlib/imgloader.h"
 
+#include <thread>
+
+
 namespace DBIMG
 {
     class Img;
@@ -25,7 +27,7 @@ namespace ARTICLE
         std::string m_url;
         Glib::RefPtr< Gdk::Pixbuf > m_pixbuf;
         DBIMG::Img* m_img;
-        JDLIB::Thread m_thread;
+        std::thread m_thread;
 
         Glib::RefPtr< JDLIB::ImgLoader > m_imgloader;
 
diff --git a/src/dbimg/delimgcachediag.cpp b/src/dbimg/delimgcachediag.cpp
index a4328f0ce..291c8ef27 100644
--- a/src/dbimg/delimgcachediag.cpp
+++ b/src/dbimg/delimgcachediag.cpp
@@ -19,6 +19,7 @@
 #include <glib/gi18n.h>
 
 #include <ctime>
+#include <system_error>
 
 
 using namespace DBIMG;
@@ -47,6 +48,7 @@ DelImgCacheDiag::~DelImgCacheDiag()
     std::cout << "DelImgCacheDiag::~DelImgCacheDiag\n";
 #endif
 
+    // m_thread.joinable() == true のときスレッドを破棄すると強制終了するため待機処理を入れる
     slot_cancel_clicked();
 }
 
@@ -65,25 +67,18 @@ bool DelImgCacheDiag::on_draw( const Cairo::RefPtr< Cairo::Context >& cr )
 void DelImgCacheDiag::launch_thread()
 {
     // スレッドを起動してキャッシュ削除
-    if( !m_thread.is_running() ) {
+    if( ! m_thread.joinable() ) {
         m_stop = false;
-        if( !m_thread.create( static_cast< STARTFUNC >( launcher ),
-                              static_cast< void* >( this ),
-                              JDLIB::NODETACH ) ) {
+        try {
+            m_thread = std::thread( &DelImgCacheDiag::main_thread, this );
+        }
+        catch( std::system_error& ) {
             MISC::ERRMSG( "DelImgCacheDiag::launch_thread : could not start thread" );
         }
     }
 }
 
 
-void* DelImgCacheDiag::launcher( void* dat )
-{
-    DelImgCacheDiag* tt = ( DelImgCacheDiag * ) dat;
-    tt->main_thread();
-    return nullptr;
-}
-
-
 // 画像キャッシュ削除スレッド
 void DelImgCacheDiag::main_thread()
 {
@@ -194,7 +189,7 @@ void DelImgCacheDiag::wait()
 #ifdef _DEBUG
     std::cout << "DelImgCacheDiag::wait\n";
 #endif
-    m_thread.join();
+    if( m_thread.joinable() ) m_thread.join();
 }
 
 
diff --git a/src/dbimg/delimgcachediag.h b/src/dbimg/delimgcachediag.h
index 8724cc521..072e97e8f 100644
--- a/src/dbimg/delimgcachediag.h
+++ b/src/dbimg/delimgcachediag.h
@@ -7,12 +7,12 @@
 #ifndef _DELIMGCACHEDIAG_H
 #define _DELIMGCACHEDIAG_H
 
-#include "jdlib/jdthread.h"
-
 #include "skeleton/dispatchable.h"
 
 #include <gtkmm.h>
 #include <ctime>
+#include <thread>
+
 
 namespace DBIMG
 {
@@ -21,7 +21,7 @@ namespace DBIMG
         Gtk::Label m_label;
 
         bool m_stop; // = true にするとスレッド停止
-        JDLIB::Thread m_thread;
+        std::thread m_thread;
 
       public:
 
@@ -31,8 +31,6 @@ namespace DBIMG
         // 画像キャッシュ削除スレッド
         void main_thread();
 
-        static void* launcher( void* dat );
-
       protected:
 
         bool on_draw( const Cairo::RefPtr< Cairo::Context >& cr ) override;
diff --git a/src/image/imageareabase.cpp b/src/image/imageareabase.cpp
index 830680d4c..497b31dc4 100644
--- a/src/image/imageareabase.cpp
+++ b/src/image/imageareabase.cpp
@@ -13,13 +13,15 @@
 #include "config/globalconf.h"
 
 #include <mutex>
+#include <system_error>
+
 
 //
 // スレッドのランチャ
 //
 static std::mutex imgarea_launcher_mutex;
 
-void* imgarea_launcher( void* dat )
+static void imgarea_launcher( IMAGE::ImageAreaBase* area )
 {
     std::lock_guard< std::mutex > lock( imgarea_launcher_mutex );
 
@@ -27,14 +29,11 @@ void* imgarea_launcher( void* dat )
     std::cout << "start imgarea_launcher" << std::endl;
 #endif
 
-    IMAGE::ImageAreaBase* area = ( IMAGE::ImageAreaBase* )( dat );
     area->load_image_thread();
 
 #ifdef _DEBUG
     std::cout << "end" << std::endl;
 #endif
-
-    return nullptr;
 }
 
 
@@ -78,6 +77,7 @@ ImageAreaBase::~ImageAreaBase()
     set_dispatchable( false );
 
     stop();
+    // m_thread.joinable() == true のときスレッドを破棄すると強制終了するため待機処理を入れる
     wait();
 }
 
@@ -98,7 +98,7 @@ void ImageAreaBase::wait()
     std::cout << "ImageAreaBase::wait" << std::endl;
 #endif 
 
-    m_thread.join();
+    if( m_thread.joinable() ) m_thread.join();
 
 #ifdef _DEBUG    
     std::cout << "ImageAreaBase::wait ok" << std::endl;
@@ -131,10 +131,17 @@ void ImageAreaBase::load_image()
 #ifdef _DEBUG
     std::cout << "ImageAreaBase::load_image" << std::endl;
 #endif
+    if( m_thread.joinable() ) {
+        MISC::ERRMSG( "ImageAreaBase::load_image : thread is already running" );
+        return;
+    }
 
-    // 大きい画像を表示しようとするとJDが固まるときがあるのでスレッドを使用する
-    // ランチャ経由で load_image_thread() を動かす
-    if( ! m_thread.create( imgarea_launcher, ( void* ) this, JDLIB::NODETACH ) ) {
+    try {
+        // 大きい画像を表示しようとするとJDが固まるときがあるのでスレッドを使用する
+        // ランチャ経由で load_image_thread() を動かす
+        m_thread = std::thread( imgarea_launcher, this );
+    }
+    catch( std::system_error& ) {
         MISC::ERRMSG( "ImageAreaBase::load_image : could not start thread" );
     }
 }
diff --git a/src/image/imageareabase.h b/src/image/imageareabase.h
index 3326af138..4168df381 100644
--- a/src/image/imageareabase.h
+++ b/src/image/imageareabase.h
@@ -11,9 +11,11 @@
 
 #include "skeleton/dispatchable.h"
 
-#include "jdlib/jdthread.h"
 #include "jdlib/imgloader.h"
 
+#include <thread>
+
+
 namespace DBIMG
 {
     class Img;
@@ -36,7 +38,7 @@ namespace IMAGE
         int m_height{};
 
         // スレッド用変数
-        JDLIB::Thread m_thread;
+        std::thread m_thread;
 
     protected:
         Glib::RefPtr< JDLIB::ImgLoader > m_imgloader;
@@ -57,7 +59,7 @@ namespace IMAGE
         const std::string& get_errmsg() const{ return m_errmsg;}        
 
         bool is_ready() const { return m_ready; }
-        bool is_loading() const { return m_thread.is_running(); }
+        bool is_loading() const noexcept { return m_thread.joinable(); }
 
         int get_width() const { return m_width; }
         int get_height() const { return m_height; }
diff --git a/src/jdlib/Makefile.am b/src/jdlib/Makefile.am
index 658f484fc..09d3d6a94 100644
--- a/src/jdlib/Makefile.am
+++ b/src/jdlib/Makefile.am
@@ -7,7 +7,6 @@ libjdlib_a_SOURCES = \
 	misctrip.cpp \
 	miscx.cpp \
 	miscgtk.cpp \
-	jdthread.cpp \
 	misccharcode.cpp \
 	heap.cpp \
 	jdiconv.cpp \
@@ -29,7 +28,6 @@ noinst_HEADERS = \
 	misctrip.h \
 	miscx.h \
 	miscgtk.h \
-	jdthread.h \
 	misccharcode.h \
 	refptr_lock.h \
 	heap.h \
diff --git a/src/jdlib/jdthread.cpp b/src/jdlib/jdthread.cpp
deleted file mode 100644
index 7d09976e4..000000000
--- a/src/jdlib/jdthread.cpp
+++ /dev/null
@@ -1,62 +0,0 @@
-// ライセンス: GPL2
-
-//#define _DEBUG
-#include "jddebug.h"
-
-#include "jdthread.h"
-#include "miscmsg.h"
-
-#include <system_error>
-
-using namespace JDLIB;
-
-
-Thread::~Thread()
-{
-    join();
-}
-
-
-// スレッド作成
-bool Thread::create( STARTFUNC func , void* arg, const bool detach, const int )
-{
-    if( m_thread.joinable() ){
-        MISC::ERRMSG( "Thread::create : thread is already running" );
-        return false;
-    }
-
-    try {
-        m_thread = std::thread( func, arg );
-    }
-    catch( std::system_error& err ) {
-        MISC::ERRMSG( err.what() );
-        return false;
-    }
-
-    if( detach ) {
-#ifdef _DEBUG
-        std::cout << "Thread::create detach" << std::endl;
-#endif
-        m_thread.detach();
-        assert( ! m_thread.joinable() );
-    }
-
-#ifdef _DEBUG
-    std::cout << "Thread::create thread = " << m_thread.get_id() << std::endl;
-#endif
-
-    return true;
-}
-
-
-bool Thread::join()
-{
-#ifdef _DEBUG
-    std::cout << "Thread::join thread = " << m_thread.get_id() << std::endl;
-#endif
-
-    if( m_thread.joinable() ) {
-        m_thread.join();
-    }
-    return true;
-}
diff --git a/src/jdlib/jdthread.h b/src/jdlib/jdthread.h
deleted file mode 100644
index d4461996e..000000000
--- a/src/jdlib/jdthread.h
+++ /dev/null
@@ -1,49 +0,0 @@
-// ライセンス: GPL2
-
-// スレッドクラス
-
-#ifndef _JDTHREAD_H
-#define _JDTHREAD_H
-
-#include <thread>
-
-
-typedef void* ( *STARTFUNC )( void * );
-
-enum
-{
-    DEFAULT_STACKSIZE = 64
-};
-
-namespace JDLIB
-{
-    enum
-    {
-        DETACH = true,
-        NODETACH = false
-    };
-
-    class Thread
-    {
-        std::thread m_thread;
-
-    public:
-
-        Thread() noexcept = default;
-        Thread( Thread&& ) noexcept = delete;
-        Thread( const Thread& ) = delete;
-        virtual ~Thread();
-
-        Thread& operator=( Thread&& ) noexcept = delete;
-        Thread& operator=( const Thread& ) = delete;
-
-        bool is_running() const noexcept { return m_thread.joinable(); }
-
-        // スレッド作成
-        bool create( STARTFUNC func , void * arg, const bool detach, const int stack_kbyte = DEFAULT_STACKSIZE );
-
-        bool join();
-    };
-}
-
-#endif
diff --git a/src/jdlib/loader.cpp b/src/jdlib/loader.cpp
index fcbc9da97..08b6a97d8 100644
--- a/src/jdlib/loader.cpp
+++ b/src/jdlib/loader.cpp
@@ -29,6 +29,7 @@
 #include <cstring>
 #include <mutex>
 #include <sstream>
+#include <system_error>
 
 #include <errno.h>
 #include <fcntl.h>
@@ -496,6 +497,7 @@ Loader::~Loader()
     std::cout << "Loader::~Loader : url = " << m_data.url << std::endl;
 #endif
 
+    // m_thread.joinable() == true のときスレッドを破棄すると強制終了するため待機処理を入れる
     clear();
 
 //    assert( ! m_loading );
@@ -524,7 +526,7 @@ void Loader::clear()
 
 void Loader::wait()
 {
-    m_thread.join();
+    if( m_thread.joinable() ) m_thread.join();
 }
 
 
@@ -735,29 +737,23 @@ void Loader::create_thread()
 #ifdef _DEBUG
     std::cout << "Loader::create_thread :  url = " << m_data.url << std::endl;
 #endif
+    if( m_thread.joinable() ) {
+        MISC::ERRMSG( "Loader::create_thread : thread is already running" );
+        return;
+    }
 
-    if( ! m_thread.create( ( STARTFUNC ) launcher, ( void * ) this, JDLIB::NODETACH ) ){
-
+    try {
+        m_thread = std::thread( &Loader::run_main, this );
+    }
+    catch( std::system_error& ) {
         m_data.code = HTTP_ERR;
         m_data.str_code = "Loader::run : could not start thread";
         MISC::ERRMSG( m_data.str_code );
         finish_loading();
-        return;
     }
 }
 
 
-//
-// スレッドのランチャ (static)
-//
-void* Loader::launcher( void* dat )
-{
-    Loader* tt = ( Loader * ) dat;
-    tt->run_main();
-    return nullptr;
-}
-
-
 bool Loader::send_connect( const int soc, std::string& errmsg )
 {
     std::string authority;
diff --git a/src/jdlib/loader.h b/src/jdlib/loader.h
index 19fec8d31..6570c2bf3 100644
--- a/src/jdlib/loader.h
+++ b/src/jdlib/loader.h
@@ -10,7 +10,6 @@
 #define _LOADER_H
 
 #include "loaderdata.h"
-#include "jdthread.h"
 
 #include <netdb.h>
 #include <zlib.h>
@@ -20,6 +19,7 @@
 #include <optional>
 #include <string>
 #include <string_view>
+#include <thread>
 #include <vector>
 
 
@@ -116,7 +116,7 @@ namespace JDLIB
 
         bool m_stop{}; // = true にするとスレッド停止
         bool m_loading{};
-        JDLIB::Thread m_thread;
+        std::thread m_thread;
         SKELETON::Loadable* m_loadable;
 
         // スレッド起動待ち状態になった時に、起動順のプライオリティを下げる
@@ -152,8 +152,6 @@ namespace JDLIB
 
     private:
 
-        static void* launcher( void* );
-
         void clear();
         void run_main();
         struct addrinfo* get_addrinfo( const std::string& hostname, const int port );
diff --git a/src/jdlib/meson.build b/src/jdlib/meson.build
index c87f5f9d1..2bda2c57b 100644
--- a/src/jdlib/meson.build
+++ b/src/jdlib/meson.build
@@ -6,7 +6,6 @@ sources = [
   'jdiconv.cpp',
   'jdmigemo.cpp',
   'jdregex.cpp',
-  'jdthread.cpp',
   'loader.cpp',
   'loaderdata.cpp',
   'misccharcode.cpp',
diff --git a/src/searchmanager.cpp b/src/searchmanager.cpp
index 7bf5faf5b..6eb1640af 100644
--- a/src/searchmanager.cpp
+++ b/src/searchmanager.cpp
@@ -15,6 +15,9 @@
 
 #include "config/globalconf.h"
 
+#include <system_error>
+
+
 CORE::Search_Manager* instance_search_manager = nullptr;
 
 CORE::Search_Manager* CORE::get_search_manager()
@@ -45,6 +48,7 @@ Search_Manager::~Search_Manager()
     set_dispatchable( false );
 
     stop( std::string() );
+    // m_thread.joinable() == true のときスレッドを破棄すると強制終了するため待機処理を入れる
     wait();
 }
 
@@ -70,7 +74,7 @@ bool Search_Manager::search( const std::string& id, const int searchmode, const
 #endif
 
     if( m_searching ) return false;
-    if( m_thread.is_running() ) return false;
+    if( m_thread.joinable() ) return false;
 
     m_searchmode = searchmode;
 
@@ -88,9 +92,12 @@ bool Search_Manager::search( const std::string& id, const int searchmode, const
     // 読み込んでおかないと大量の warning が出る
     if( m_searchmode == SEARCHMODE_ALLLOG ) DBTREE::read_boardinfo_all();
 
-    if( ! m_thread.create( ( STARTFUNC ) launcher, ( void * ) this, JDLIB::NODETACH ) ){
+    try {
+        m_thread = std::thread( &Search_Manager::thread_search, this );
+    }
+    catch( std::system_error& ) {
         MISC::ERRMSG( "Search_Manager::search : could not start thread" );
-        return FALSE;
+        return false;
     }
 
     m_searching = true;
@@ -98,17 +105,6 @@ bool Search_Manager::search( const std::string& id, const int searchmode, const
 }
 
 
-//
-// スレッドのランチャ (static)
-//
-void* Search_Manager::launcher( void* dat )
-{
-    Search_Manager* sm = ( Search_Manager * ) dat;
-    sm->thread_search();
-    return nullptr;
-}
-
-
 //
 // ログ検索実行スレッド
 //
@@ -195,7 +191,7 @@ void Search_Manager::stop( const std::string& id )
 
 void Search_Manager::wait()
 {
-    m_thread.join();
+    if( m_thread.joinable() ) m_thread.join();
 }
 
 
diff --git a/src/searchmanager.h b/src/searchmanager.h
index 6a4cc628d..789755bfb 100644
--- a/src/searchmanager.h
+++ b/src/searchmanager.h
@@ -9,13 +9,12 @@
 
 #include "skeleton/dispatchable.h"
 
-#include "jdlib/jdthread.h"
-
 #include <gtkmm.h>
 
 #include <list>
 #include <memory>
 #include <string>
+#include <thread>
 
 
 namespace DBTREE
@@ -52,7 +51,7 @@ namespace CORE
 
         SIG_SEARCH_FIN m_sig_search_fin;
 
-        JDLIB::Thread m_thread;
+        std::thread m_thread;
 
         int m_searchmode{};
         std::string m_id;
@@ -109,7 +108,6 @@ namespace CORE
 
       private:
 
-        static void* launcher( void* );
         void wait();
         void thread_search();
         void callback_dispatch() override;
diff --git a/src/sound/playsound.cpp b/src/sound/playsound.cpp
index 923044f9b..203d384d9 100644
--- a/src/sound/playsound.cpp
+++ b/src/sound/playsound.cpp
@@ -14,6 +14,7 @@
 #include <algorithm>
 #include <cstdio>
 #include <string>
+#include <system_error>
 #include <vector>
 
 
@@ -56,6 +57,7 @@ Play_Sound::~Play_Sound()
     set_dispatchable( false );
 
     stop();
+    // m_thread.joinable() == true のときスレッドを破棄すると強制終了するため待機処理を入れる
     wait();
 }
 
@@ -75,7 +77,7 @@ void Play_Sound::stop()
 
 void Play_Sound::wait()
 {
-    m_thread.join();
+    if( m_thread.joinable() ) m_thread.join();
 }
 
 
@@ -85,7 +87,7 @@ void Play_Sound::wait()
 void Play_Sound::play( const std::string& wavfile )
 {
     if( wavfile.empty() ) return;
-    if( m_thread.is_running() ){
+    if( m_thread.joinable() ){
         MISC::ERRMSG( "Play_Sound::play : thread has been running" );
         return;
     }
@@ -93,23 +95,13 @@ void Play_Sound::play( const std::string& wavfile )
     m_wavfile = wavfile;
     m_stop = false;
 
-    if( ! m_thread.create( ( STARTFUNC ) launcher, ( void * ) this, JDLIB::NODETACH ) ){
-        MISC::ERRMSG( "Play_Sound::play : could not start thread" );
-    }
-    else{
+    try {
+        m_thread = std::thread( &Play_Sound::play_wavfile, this );
         m_playing = true;
     }
-}
-
-
-//
-// スレッドのランチャ (static)
-//
-void* Play_Sound::launcher( void* dat )
-{
-    Play_Sound* ps = ( Play_Sound * ) dat;
-    ps->play_wavfile();
-    return nullptr;
+    catch( std::system_error& ) {
+        MISC::ERRMSG( "Play_Sound::play : could not start thread" );
+    }
 }
 
 
diff --git a/src/sound/playsound.h b/src/sound/playsound.h
index bc5fdab3a..403e6a473 100644
--- a/src/sound/playsound.h
+++ b/src/sound/playsound.h
@@ -12,9 +12,9 @@
 #ifdef USE_ALSA
 
 #include "skeleton/dispatchable.h"
-#include "jdlib/jdthread.h"
 
 #include <cstdint>
+#include <thread>
 
 
 namespace SOUND
@@ -49,7 +49,7 @@ namespace SOUND
 
     class Play_Sound : public SKELETON::Dispatchable
     {
-        JDLIB::Thread m_thread;
+        std::thread m_thread;
         std::string m_wavfile;
         bool m_stop{};
         bool m_playing{};
@@ -67,7 +67,6 @@ namespace SOUND
       private:
 
         void wait();
-        static void* launcher( void* );
         void play_wavfile();
         void callback_dispatch() override;