diff --git a/.github/workflows/labeler.yaml b/.github/workflows/labeler.yaml
new file mode 100644
index 0000000..4330491
--- /dev/null
+++ b/.github/workflows/labeler.yaml
@@ -0,0 +1,81 @@
+name: PR Labeler
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+    branches:
+      - develop
+
+jobs:
+  labeler:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Fetch all branches
+        run: git fetch --all
+
+      - name: Extract commit messages
+        run: |
+          COMMITS=$(git log --format=%B origin/develop..HEAD)
+          echo "$COMMITS"
+          echo "$COMMITS" > commits.txt
+
+      - name: Debug - Print commits
+        run: cat commits.txt
+
+      - name: Set labels based on commit messages
+        id: set-labels
+        run: |
+          labels=()
+          while IFS= read -r commit; do
+            echo "Processing commit: $commit"
+            if [[ $commit =~ ^feat ]]; then
+              labels+=("feature")
+            elif [[ $commit =~ ^fix ]]; then
+              labels+=("bugfix")
+            elif [[ $commit =~ ^docs ]]; then
+              labels+=("documentation")
+            elif [[ $commit =~ ^style ]]; then
+              labels+=("style")
+            elif [[ $commit =~ ^refactor ]]; then
+              labels+=("refactor")
+            elif [[ $commit =~ ^test ]]; then
+              labels+=("test")
+            elif [[ $commit =~ ^ci ]]; then
+              labels+=("ci")
+            elif [[ $commit =~ ^chore ]]; then
+              labels+=("chore")
+            fi
+          done < commits.txt
+
+          # Remove duplicate labels and join them as a newline-separated string
+          unique_labels=$(printf "%s\n" "${labels[@]}" | sort -u)
+
+          # Debug output for unique labels
+          echo "Unique labels:"
+          echo "$unique_labels"
+
+          # Set the output as a newline-separated string
+          echo "labels<<EOF" >> $GITHUB_OUTPUT
+          echo "$unique_labels" >> $GITHUB_OUTPUT
+          echo "EOF" >> $GITHUB_OUTPUT
+
+      - name: Add labels to PR
+        uses: actions-ecosystem/action-add-labels@v1
+        with:
+          labels: ${{ steps.set-labels.outputs.labels }}
+
+      - name: Assign PR creator
+        uses: actions/github-script@v6
+        with:
+          script: |
+            await github.rest.issues.addAssignees({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              assignees: [context.actor]
+            })
diff --git a/.gitmessage b/.gitmessage
new file mode 100644
index 0000000..75439b9
--- /dev/null
+++ b/.gitmessage
@@ -0,0 +1,18 @@
+# Overview (Uncomment one of the following templates)
+#feat:
+# └  A new feature
+#fix:
+# └  A bug fix
+#docs:
+# └  Documentation only changes
+#style:
+# └  Changes that do not affect the meaning of the code
+#    (white-space, formatting, missing semi-colons, etc)
+#refactor:
+# └  A code change that neither fixes a bug nor adds a featur
+#test:
+# └  Adding missing or correcting existing tests
+#ci:
+# └  Changes to our CI configuration files and scripts
+#chore:
+# └  Updating grunt tasks etc; no production code change
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 2476714..182c0b8 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -59,6 +59,9 @@
       "icon": "issue-closed"
     }
   },
+  "files.associations": {
+	  ".gitmessage": "plaintext"
+	},
   "python.testing.unittestEnabled": false,
   "python.testing.pytestEnabled": true,
   "python.testing.autoTestDiscoverOnSaveEnabled": true,
diff --git a/docs/en/developer_guidelines/index.md b/docs/en/developer_guidelines/index.md
index b2d3caa..a92b9fc 100644
--- a/docs/en/developer_guidelines/index.md
+++ b/docs/en/developer_guidelines/index.md
@@ -44,7 +44,67 @@ While there are no strict rules, the following naming conventions are recommende
 - `bugfix/xxx`: (xxx represents the bug being fixed)
 - `hotfix/xxx`: (xxx represents the urgent fix)
 
-### Merging
+## Conventional Commits
+
+The commit messages should preferably follow the　[Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) guidelines.
+
+### Commit Message Format
+
+By using `.gitmessage`, a template for commit messages is provided. This template can be enabled locally for this project by configuring `git config --local`.
+
+```bash
+git config --local commit.template .gitmessage
+```
+
+Once configured, running `git commit` will display the contents of `.gitmessage` in your editor (Vim by default).
+
+```bash
+git commit
+# Overview (Uncomment one of the following templates)
+#feat: 
+# └  A new feature
+#fix:
+# └  A bug fix
+#docs:
+# └  Documentation only changes
+#style:
+# └  Changes that do not affect the meaning of the code
+#    (white-space, formatting, missing semi-colons, etc)
+#refactor:
+# └  A code change that neither fixes a bug nor adds a featur
+#test:
+# └  Adding missing or correcting existing tests
+#ci:
+# └  Changes to our CI configuration files and scripts
+#chore:
+# └  Updating grunt tasks etc; no production code change
+
+```
+
+Select the appropriate template and uncomment it, then write your commit message.
+
+```bash
+docs: Update README.md
+# └  Documentation only changes
+```
+
+## Correspondence between Commit Messages and Labels
+
+When creating a PR to the `develop` branch, labels are automatically assigned based on the commit messages.
+Below is the correspondence between prefixes and labels:
+
+| Prefix | Label | Description |
+|---|---|---|
+|feat: | `feature` | Adding a new feature |
+|fix: | `bugfix` | Bug fixes |
+|docs: | `documentation` | Documentation only changes |
+|style: | `style` | Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc) |
+|refactor: | `refactor` | Code changes that neither fix a bug nor add a feature |
+|test: | `test` | Adding or correcting existing tests |
+|ci: | `ci` | Adding or updating CI configuration and scripts |
+|chore: | `chore` | Minor changes or maintenance tasks |
+
+## Merging
 
 Follow the principles below for merging:
 
diff --git a/docs/ja/developer_guidelines/index.md b/docs/ja/developer_guidelines/index.md
index e856deb..07a0d20 100644
--- a/docs/ja/developer_guidelines/index.md
+++ b/docs/ja/developer_guidelines/index.md
@@ -44,6 +44,67 @@ gitGraph LR:
 - `bugfix/xxx`: （xxxはバグ修正の内容）
 - `hotfix/xxx`: (xxxは緊急修正の内容)
 
+## コミットメッセージ
+
+コミットメッセージは[Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/)に従うことが望ましいです。
+
+### コミットメッセージのフォーマット
+
+.gitmessageを利用することでコミットメッセージのテンプレートを提供します。
+これは`git config --local`に設定することで、本プロジェクト内でのみ有効になります。
+
+```bash
+git config --local commit.template .gitmessage
+```
+
+この設定を行うことで、`git commit`を実行した際に`.gitmessage`の内容がエディタ(デフォルトではVim)に表示されます。
+
+```bash
+git commit
+# Overview (Uncomment one of the following templates)
+#feat: 
+# └  A new feature
+#fix:
+# └  A bug fix
+#docs:
+# └  Documentation only changes
+#style:
+# └  Changes that do not affect the meaning of the code
+#    (white-space, formatting, missing semi-colons, etc)
+#refactor:
+# └  A code change that neither fixes a bug nor adds a featur
+#test:
+# └  Adding missing or correcting existing tests
+#ci:
+# └  Changes to our CI configuration files and scripts
+#chore:
+# └  Updating grunt tasks etc; no production code change
+
+```
+
+適切なテンプレートを選択し、コメントアウトをはずしてコミットメッセージを記述してください。
+
+```bash
+docs: Update README.md
+# └  Documentation only changes
+```
+
+## コミットメッセージとラベルの対応
+
+`develop`ブランチへのPRを作成するときにコミットメッセージからラベルを自動で付与するように設定しています。
+以下、プレフィックスとラベルの対応です。
+
+|　プレフィックス | ラベル | 説明|
+|---|---|---|
+|feat: | `feature` | 新機能の追加|
+|fix: | `bugfix` | バグの修正|
+|docs: | `documentation` | ドキュメントのみの変更|
+|style: | `style` | コードの意味に影響を与えない変更（空白、フォーマット、セミコロンの欠落など）|
+|refactor: | `refactor` | バグの修正や機能の追加を行わないコードの変更|
+|test: | `test` | テストの追加、修正|
+|ci: | `ci` | CIの追加、修正|
+|chore: | `chore` | 些末な変更 |
+
 ### マージ
 
 以下の原則に従ってマージを行います。