diff --git a/.changeset/soft-dolphins-cheat.md b/.changeset/soft-dolphins-cheat.md
new file mode 100644
index 0000000..8a098ed
--- /dev/null
+++ b/.changeset/soft-dolphins-cheat.md
@@ -0,0 +1,5 @@
+---
+"uroborosql-fmt": minor
+---
+
+Add indentTab settings
diff --git a/README.md b/README.md
index b28c222..6343b87 100644
--- a/README.md
+++ b/README.md
@@ -54,7 +54,8 @@ You can enable format on save for SQL by having the following values in your set
   "remove_redundant_nest": true,
   "complement_sql_id": true,
   "convert_double_colon_cast": false,
-  "unify_not_equal": true
+  "unify_not_equal": true,
+  "indent_tab": true
 }
 ```
 
@@ -78,6 +79,7 @@ If there is no configuration file, the default values are used.
 | [`complement_sql_id`](https://github.com/future-architect/uroborosql-fmt/blob/main/docs/options/complement_sql_id.md)                       | bool                                 | Complement [SQL ID](https://palette-doc.rtfa.as/coding-standards/forSQL/SQL%E3%82%B3%E3%83%BC%E3%83%87%E3%82%A3%E3%83%B3%E3%82%B0%E8%A6%8F%E7%B4%84%EF%BC%88uroboroSQL%EF%BC%89.html#sql-%E8%AD%98%E5%88%A5%E5%AD%90).                                 | false   |
 | [`convert_double_colon_cast`](https://github.com/future-architect/uroborosql-fmt/blob/main/docs/options/convert_double_colon_cast.md)       | bool                                 | Convert casts by `X::type` to the form `CAST(X AS type)`.                                                                                                                                                                                              | true    |
 | [`unify_not_equal`](https://github.com/future-architect/uroborosql-fmt/blob/main/docs/options/unify_not_equal.md)                           | bool                                 | Convert comparison operator `<>` to `!=`                                                                                                                                                                                                               | true    |
+| [`indent_tab`](https://github.com/future-architect/uroborosql-fmt/blob/main/docs/options/indent_tab.md)                                     | bool                                 | Switch the indentation style between tabs and spaces.                                                                                                                                                                                                  | true    |
 
 ## Available Commands
 
diff --git a/client/src/command.ts b/client/src/command.ts
index 8c915fb..a7e583b 100644
--- a/client/src/command.ts
+++ b/client/src/command.ts
@@ -28,6 +28,7 @@ const vsCodeConfigurationsObject = {
   complementSqlId: null,
   convertDoubleColonCast: null,
   unifyNotEqual: null,
+  indentTab: null,
 } satisfies ConfigurationRecord;
 
 type ConfigurationRecord = {
@@ -46,6 +47,7 @@ type ConfigurationRecord = {
   complementSqlId: boolean | null | undefined;
   convertDoubleColonCast: boolean | null | undefined;
   unifyNotEqual: boolean | null | undefined;
+  indentTab: boolean | null | undefined;
 };
 
 // WorkspaceConfigurationを受け取り、フォーマッタで利用する設定のみのRecordにして返す
diff --git a/package.json b/package.json
index 2dc2e98..de17b20 100644
--- a/package.json
+++ b/package.json
@@ -226,6 +226,19 @@
           ],
           "default": null,
           "markdownDescription": "Convert comparison operator `<>` to `!=`. If this value is null, uroborosql-fmt refers the configuration file or uses the default value."
+        },
+        "uroborosql-fmt.indentTab": {
+          "type": [
+            "boolean",
+            "null"
+          ],
+          "enum": [
+            true,
+            false,
+            null
+          ],
+          "default": null,
+          "markdownDescription": "Switch the indentation style between tabs and spaces. If this value is null, uroborosql-fmt refers the configuration file or uses the default value."
         }
       }
     }
diff --git a/server/package-lock.json b/server/package-lock.json
index 9355bf9..3aef99a 100644
--- a/server/package-lock.json
+++ b/server/package-lock.json
@@ -21,7 +21,7 @@
     "node_modules/uroborosql-fmt-napi": {
       "version": "0.0.0",
       "resolved": "file:uroborosql-fmt-napi-0.0.0.tgz",
-      "integrity": "sha512-nx47epBvAP4CZqxVImp4FQUqvz69fkUkmYdhC+TySvWfRRWBh2SwR0xtnEuSufpWRT+mGsuB2GMemlTc7ABvIA==",
+      "integrity": "sha512-fS7k63YIRbZCqBBMeqZtrhzoauoekI/Fhb0jS7oupxnqKzyXefF89uqiuRy/WYYM773I2YY8BjNAuKSsF8HJ5A==",
       "license": "BUSL-1.1",
       "engines": {
         "node": ">= 10"
diff --git a/server/src/server.ts b/server/src/server.ts
index 07aa70f..2c6d6af 100644
--- a/server/src/server.ts
+++ b/server/src/server.ts
@@ -104,6 +104,7 @@ type ConfigurationSettings = {
   complementSqlId: boolean | null | undefined;
   convertDoubleColonCast: boolean | null | undefined;
   unifyNotEqual: boolean | null | undefined;
+  indentTab: boolean | null | undefined;
 };
 
 function getSettings(resource: string): Thenable<ConfigurationSettings> {