diff --git a/src/dbtree/articlebase.cpp b/src/dbtree/articlebase.cpp
index 8ce7f90ff..b8182c1f3 100644
--- a/src/dbtree/articlebase.cpp
+++ b/src/dbtree/articlebase.cpp
@@ -19,11 +19,12 @@
 
 #include "config/globalconf.h"
 
-#include "httpcode.h"
-#include "command.h"
 #include "cache.h"
+#include "command.h"
 #include "global.h"
+#include "httpcode.h"
 #include "login2ch.h"
+#include "replacestrmanager.h"
 #include "session.h"
 #include "updatemanager.h"
 
@@ -423,6 +424,29 @@ void ArticleBase::reset_status()
 }
 
 
+/** @brief 置換文字列を適用したスレタイトルを返す
+ *
+ * @details
+ * 置換したスレタイトルはキャッシュされて再び呼び出されたときに返す。
+ * @param[in] renew true のときキャッシュの有無に関係なく置換文字列を適用して更新する
+ */
+const std::string& ArticleBase::get_modified_subject( const bool renew )
+{
+    if( renew || m_modified_subject.empty() ){
+        const CORE::ReplaceStr_Manager* const mgr = CORE::get_replacestr_manager();
+
+        // タイトル文字列置換
+        if( mgr->list_get_active( CORE::REPLACETARGET_SUBJECT ) ){
+            m_modified_subject = mgr->replace( m_subject, CORE::REPLACETARGET_SUBJECT );
+        }
+        else m_modified_subject = m_subject;
+
+    }
+
+    return m_modified_subject;
+}
+
+
 void ArticleBase::set_subject( const std::string& subject )
 {
     if( subject.empty() ) return;
diff --git a/src/dbtree/articlebase.h b/src/dbtree/articlebase.h
index 6d7de465a..2449813f6 100644
--- a/src/dbtree/articlebase.h
+++ b/src/dbtree/articlebase.h
@@ -52,6 +52,7 @@ namespace DBTREE
         std::string m_org_host;
 
         std::string m_subject;           // サブジェクト
+        std::string m_modified_subject;  // 置換で変更されたサブジェクト
         int m_number{};                  // サーバ上にあるレスの数
         int m_number_diff{};             // レス増分( subject.txt をロードした時の m_number の増分 )
         int m_number_new{};              // 新着数( ロードした時の差分読み込み数)
@@ -143,6 +144,7 @@ namespace DBTREE
         const std::string& get_id() const { return m_id; }
         const std::string& get_key() const { return m_key; }
         const std::string& get_subject() const { return m_subject; }
+        const std::string& get_modified_subject( const bool renew = false );
         int get_number() const noexcept { return m_number; }
         int get_number_diff() const noexcept { return m_number_diff; }
         int get_number_new() const noexcept { return m_number_new; }
diff --git a/src/dbtree/interface.cpp b/src/dbtree/interface.cpp
index ed1a3d63f..9d666f571 100644
--- a/src/dbtree/interface.cpp
+++ b/src/dbtree/interface.cpp
@@ -928,11 +928,15 @@ std::string DBTREE::article_ext_err( const std::string& url )
     return DBTREE::get_article( url )->get_ext_err();
 }
 
-std::string DBTREE::article_subject( const std::string& url )
+const std::string& DBTREE::article_subject( const std::string& url )
 {
     return DBTREE::get_article( url )->get_subject();
 }
 
+const std::string& DBTREE::article_modified_subject( const std::string& url, const bool renew )
+{
+    return DBTREE::get_article( url )->get_modified_subject( renew );
+}
 
 int DBTREE::article_number( const std::string& url )
 {
diff --git a/src/dbtree/interface.h b/src/dbtree/interface.h
index 341bcb90c..607eda995 100644
--- a/src/dbtree/interface.h
+++ b/src/dbtree/interface.h
@@ -227,7 +227,8 @@ namespace DBTREE
     int article_code( const std::string& url );
     std::string article_str_code( const std::string& url );
     std::string article_ext_err( const std::string& url );
-    std::string article_subject( const std::string& url );
+    const std::string& article_subject( const std::string& url );
+    const std::string& article_modified_subject( const std::string& url, const bool renew = false );
     int article_number( const std::string& url );
     int article_number_load( const std::string& url );
     int article_number_seen( const std::string& url );