diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
new file mode 100644
index 000000000..e78ea55ed
--- /dev/null
+++ b/.devcontainer/Dockerfile
@@ -0,0 +1,8 @@
+FROM ruby:2
+LABEL maintainer "@tdtds <t@tdtds.jp>"
+
+RUN apt update && apt install -y apt-utils libidn11-dev sqlite3 libsqlite3-dev
+RUN mkdir -p /workspace
+WORKDIR /workspace
+EXPOSE 9292
+CMD "/workspace/.devcontainer/run-app.sh"
diff --git a/misc/docker-devel/README.md b/.devcontainer/README.md
similarity index 68%
rename from misc/docker-devel/README.md
rename to .devcontainer/README.md
index 4bb18703d..56b8435a9 100644
--- a/misc/docker-devel/README.md
+++ b/.devcontainer/README.md
@@ -3,13 +3,13 @@
 ## how to build
 
 ```
-% docker build -t tdiary-devel misc/docker-devel
+% docker build -t tdiary-devel .devcontainer
 ```
 
 ## how to run
 
 ```
-% docker run -v $(pwd):/usr/src/app -p 9292:9292 -it --rm tdiary-devel
+% docker run -v $(pwd):/workspace -p 9292:9292 -it --rm tdiary-devel
 ```
 
 or debugging `contrib` in the parent directory:
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
new file mode 100644
index 000000000..0ca1b49f8
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,34 @@
+// For format details, see https://aka.ms/vscode-remote/devcontainer.json or this file's README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.122.1/containers/docker-existing-dockerfile
+{
+	"name": "Existing Dockerfile",
+
+	// Sets the run context to one level up instead of the .devcontainer folder.
+	"context": "..",
+
+	// Update the 'dockerFile' property if you aren't using the standard 'Dockerfile' filename.
+	"dockerFile": "Dockerfile",
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": { 
+		"terminal.integrated.shell.linux": null
+	},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": []
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	"forwardPorts": [9292],
+
+	// Uncomment the next line to run commands after the container is created - for example installing curl.
+	// "postCreateCommand": "apt-get update && apt-get install -y curl",
+
+	// Uncomment when using a ptrace-based debugger like C++, Go, and Rust
+	// "runArgs": [ "--cap-add=SYS_PTRACE", "--security-opt", "seccomp=unconfined" ],
+
+	// Uncomment to use the Docker CLI from inside the container. See https://aka.ms/vscode-remote/samples/docker-from-docker.
+	// "mounts": [ "source=/var/run/docker.sock,target=/var/run/docker.sock,type=bind" ],
+
+	// Uncomment to connect as a non-root user. See https://aka.ms/vscode-remote/containers/non-root.
+	// "remoteUser": "vscode"
+}
diff --git a/misc/docker-devel/run-app.sh b/.devcontainer/run-app.sh
old mode 100755
new mode 100644
similarity index 94%
rename from misc/docker-devel/run-app.sh
rename to .devcontainer/run-app.sh
index bded72f95..bec8f3a86
--- a/misc/docker-devel/run-app.sh
+++ b/.devcontainer/run-app.sh
@@ -1,5 +1,4 @@
 #!/bin/bash
-cd /usr/src/app
 if [ ! -f tdiary.conf ]; then
 	cp tdiary.conf.beginner tdiary.conf
 fi
diff --git a/.gitignore b/.gitignore
index 94420c312..3d970d3b3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,3 +18,4 @@ doc/*.html
 /Gemfile.local
 spec/javascripts/lib
 node_modules
+public/assets
\ No newline at end of file
diff --git a/misc/docker-devel/Dockerfile b/misc/docker-devel/Dockerfile
deleted file mode 100644
index 4ea76772b..000000000
--- a/misc/docker-devel/Dockerfile
+++ /dev/null
@@ -1,8 +0,0 @@
-FROM ruby:2.5
-LABEL maintainer "@tdtds <t@tdtds.jp>"
-
-RUN mkdir -p /usr/src/app
-WORKDIR /usr/src
-COPY [ "run-app.sh", "/usr/src/" ]
-EXPOSE 9292
-CMD "/usr/src/run-app.sh"