diff --git a/database/migrations/2026_01_16_144753_create_management_table.php b/database/migrations/2026_01_16_144753_create_management_table.php
index b7e5ccc..af378c7 100644
--- a/database/migrations/2026_01_16_144753_create_management_table.php
+++ b/database/migrations/2026_01_16_144753_create_management_table.php
@@ -12,7 +12,7 @@ return new class extends Migration
     public function up(): void
     {
         Schema::create('management', function (Blueprint $table) {
-            $table->id('management_id');  // 主キー、AUTO_INCREMENT, NOT NULL
+            $table->increments('management_id');  // 主キー、AUTO_INCREMENT, NOT NULL
             $table->string('management_name', 255);  // varchar(255), NOT NULL
             $table->string('management_code', 10)->unique();  // varchar(10), NOT NULL, UNIQUE
             $table->boolean('municipality_flag')->nullable();  // tinyint(1), NULL