diff --git a/.github/codeowners b/.github/codeowners
index 98ba3f3..b5914d4 100644
--- a/.github/codeowners
+++ b/.github/codeowners
@@ -1,3 +1,4 @@
 * @timedia/styleguide
 
+/ecmascript @timedia/styleguide-ecmascript
 /ruby @timedia/styleguide-ruby
diff --git a/.github/labeler.yml b/.github/labeler.yml
index 798a15d..4d761e6 100644
--- a/.github/labeler.yml
+++ b/.github/labeler.yml
@@ -1,5 +1,9 @@
+ecmascript:
+  - ecmascript/**
+
 ruby:
   - ruby/**
 
 others:
+  - '!ecmascript/**'
   - '!ruby/**'
diff --git a/.gitignore b/.gitignore
index 9343d2a..691fb72 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,4 @@
+ecmascript/**/node_modules
+ecmascript/package-lock.json
+ecmascript/yarn.lock
 ruby/Gemfile.lock
diff --git a/README.md b/README.md
index f5ebf17..0bbc4de 100644
--- a/README.md
+++ b/README.md
@@ -4,3 +4,5 @@
 ## 対応言語と Linter/Formatter の一覧
 - [Ruby](ruby/README.md)
   - RuboCop
+- [ECMAScript/TypeScript](ecmascript/README.md)
+  - ESLint
diff --git a/ecmascript/.eslintrc.yaml b/ecmascript/.eslintrc.yaml
new file mode 100644
index 0000000..fb28857
--- /dev/null
+++ b/ecmascript/.eslintrc.yaml
@@ -0,0 +1,4 @@
+env:
+  node: true
+extends:
+  - "@timedia"
diff --git a/ecmascript/README.md b/ecmascript/README.md
new file mode 100644
index 0000000..8278bc4
--- /dev/null
+++ b/ecmascript/README.md
@@ -0,0 +1,12 @@
+# ECMAScript/TypeScript 用 Linter/Formatter 設定
+
+## Linter/Formatter
+- ESLint
+
+### 設定ファイルのバリエーション
+#### ESLint
+- [ECMAScript Base](./packages/eslint-config/index.js)
+- [TypeScript Base](./packages/eslint-config/typescript.js)
+
+## 使い方
+TODO
diff --git a/ecmascript/package.json b/ecmascript/package.json
new file mode 100644
index 0000000..2748df1
--- /dev/null
+++ b/ecmascript/package.json
@@ -0,0 +1,10 @@
+{
+  "private": true,
+  "workspaces": [
+    "packages/*"
+  ],
+  "devDependencies": {
+    "@timedia/eslint-config": "*",
+    "eslint": "^8.17.0"
+  }
+}
diff --git a/ecmascript/packages/eslint-config/configs/eslint-comments.js b/ecmascript/packages/eslint-config/configs/eslint-comments.js
new file mode 100644
index 0000000..bae6f51
--- /dev/null
+++ b/ecmascript/packages/eslint-config/configs/eslint-comments.js
@@ -0,0 +1,8 @@
+/*
+ * eslint-plugin-eslint-comments パッケージで定義されたルールを有効化/無効化する
+ */
+module.exports = {
+  extends: [
+    "plugin:eslint-comments/recommended",
+  ],
+};
diff --git a/ecmascript/packages/eslint-config/configs/eslint.js b/ecmascript/packages/eslint-config/configs/eslint.js
new file mode 100644
index 0000000..a18e9d1
--- /dev/null
+++ b/ecmascript/packages/eslint-config/configs/eslint.js
@@ -0,0 +1,8 @@
+/*
+ * ESLint 本体に定義されたルールを有効化/無効化する
+ */
+module.exports = {
+  extends: [
+    "eslint:recommended",
+  ],
+};
diff --git a/ecmascript/packages/eslint-config/configs/typescript-eslint.js b/ecmascript/packages/eslint-config/configs/typescript-eslint.js
new file mode 100644
index 0000000..740f55a
--- /dev/null
+++ b/ecmascript/packages/eslint-config/configs/typescript-eslint.js
@@ -0,0 +1,14 @@
+/*
+ * @typescript-eslint/eslint-plugin パッケージで定義されたルールを有効化/無効化する
+ */
+module.exports = {
+  extends: [
+    "plugin:@typescript-eslint/recommended",
+  ],
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+    "ecmaVersion": "latest",
+    "sourceType": "module",
+  },
+};
+
diff --git a/ecmascript/packages/eslint-config/index.js b/ecmascript/packages/eslint-config/index.js
new file mode 100644
index 0000000..aed942f
--- /dev/null
+++ b/ecmascript/packages/eslint-config/index.js
@@ -0,0 +1,9 @@
+/*
+ * TypeScript を使わない/使えないプロジェクト向けのルールセット
+ */
+module.exports = {
+  extends: [
+    "./configs/eslint.js",
+    "./configs/eslint-comments.js",
+  ],
+};
diff --git a/ecmascript/packages/eslint-config/package.json b/ecmascript/packages/eslint-config/package.json
new file mode 100644
index 0000000..9f1dc5f
--- /dev/null
+++ b/ecmascript/packages/eslint-config/package.json
@@ -0,0 +1,29 @@
+{
+  "name": "@timedia/eslint-config",
+  "version": "0.1.0",
+  "description": "The default ESLint configuration for TIMEINTERMEDIA, Inc.",
+  "main": "index.js",
+  "repository": "https://github.com/timedia/styleguide.git",
+  "author": "Ryo MAEDA",
+  "devDependencies": {
+    "@typescript-eslint/eslint-plugin": "^5.27.0",
+    "@typescript-eslint/parser": "^5.27.0",
+    "eslint": "^8.17.0",
+    "eslint-plugin-eslint-comments": "^3.2.0",
+    "typescript": "^4.7.3"
+  },
+  "peerDependencies": {
+    "@typescript-eslint/eslint-plugin": "^5.27.0",
+    "@typescript-eslint/parser": "^5.27.0",
+    "eslint": "^8.17.0",
+    "eslint-plugin-eslint-comments": "^3.2.0"
+  },
+  "peerDependenciesMeta": {
+    "@typescript-eslint/eslint-plugin": {
+      "optional": true
+    },
+    "@typescript-eslint/parser": {
+      "optional": true
+    }
+  }
+}
diff --git a/ecmascript/packages/eslint-config/typescript.js b/ecmascript/packages/eslint-config/typescript.js
new file mode 100644
index 0000000..e657514
--- /dev/null
+++ b/ecmascript/packages/eslint-config/typescript.js
@@ -0,0 +1,10 @@
+/*
+ * TypeScript を使うプロジェクト向けのルールセット
+ */
+module.exports = {
+  extends: [
+    "./configs/eslint.js",
+    "./configs/eslint-comments.js",
+    "./configs/typescript-eslint.js",
+  ],
+};
diff --git a/ruby/README.md b/ruby/README.md
index f36c0c5..31a1d42 100644
--- a/ruby/README.md
+++ b/ruby/README.md
@@ -4,6 +4,7 @@
 - RuboCop
 
 ### 設定ファイルのバリエーション
+#### RuboCop
 - [Base](./rubocop/config/base.yml)
 - [Rails](./rubocop/config/rails.yml)
 - [RSpec](./rubocop/config/rspec.yml)