diff --git a/app/Http/Controllers/Api/ActivityController.php b/app/Http/Controllers/Api/ActivityController.php
index 4424063..22eb6f8 100644
--- a/app/Http/Controllers/Api/ActivityController.php
+++ b/app/Http/Controllers/Api/ActivityController.php
@@ -58,7 +58,7 @@ class ActivityController extends Controller
             'start_at' => ['nullable', 'date'],
             'end_at' => ['nullable', 'date'],
             'address' => ['nullable', 'string', 'max:255'],
-            'contact_phone' => ['nullable', 'string', 'max:64'],
+            'contact_phone' => ['nullable', 'string', 'max:255'],
             'lat' => ['nullable', 'numeric'],
             'lng' => ['nullable', 'numeric'],
             'detail_html' => ['nullable', 'string'],
@@ -113,7 +113,7 @@ class ActivityController extends Controller
             'start_at' => ['nullable', 'date'],
             'end_at' => ['nullable', 'date'],
             'address' => ['nullable', 'string', 'max:255'],
-            'contact_phone' => ['nullable', 'string', 'max:64'],
+            'contact_phone' => ['nullable', 'string', 'max:255'],
             'lat' => ['nullable', 'numeric'],
             'lng' => ['nullable', 'numeric'],
             'detail_html' => ['nullable', 'string'],
diff --git a/app/Http/Controllers/Api/VenueController.php b/app/Http/Controllers/Api/VenueController.php
index 3fbc0ad..e1b7128 100644
--- a/app/Http/Controllers/Api/VenueController.php
+++ b/app/Http/Controllers/Api/VenueController.php
@@ -34,7 +34,7 @@ class VenueController extends Controller
             'visit_form' => ['nullable', 'string'],
             'consultation_hours' => ['nullable', 'string'],
             'address' => ['nullable', 'string', 'max:255'],
-            'contact_phone' => ['nullable', 'string', 'max:64'],
+            'contact_phone' => ['nullable', 'string', 'max:255'],
             'lat' => ['nullable', 'numeric'],
             'lng' => ['nullable', 'numeric'],
             'cover_image' => ['nullable', 'string', 'max:255'],
@@ -146,7 +146,7 @@ class VenueController extends Controller
             'visit_form' => ['nullable', 'string'],
             'consultation_hours' => ['nullable', 'string'],
             'address' => ['nullable', 'string', 'max:255'],
-            'contact_phone' => ['nullable', 'string', 'max:64'],
+            'contact_phone' => ['nullable', 'string', 'max:255'],
             'lat' => ['nullable', 'numeric'],
             'lng' => ['nullable', 'numeric'],
             'cover_image' => ['nullable', 'string', 'max:255'],
diff --git a/app/Services/VenueImportService.php b/app/Services/VenueImportService.php
index 46b47d7..6a0cd25 100644
--- a/app/Services/VenueImportService.php
+++ b/app/Services/VenueImportService.php
@@ -308,7 +308,7 @@ class VenueImportService
             'detail_html' => ['nullable', 'string'],
             'reservation_notice' => ['nullable', 'string'],
             'address' => ['nullable', 'string', 'max:255'],
-            'contact_phone' => ['nullable', 'string', 'max:64'],
+            'contact_phone' => ['nullable', 'string', 'max:255'],
             'lat' => ['nullable', 'numeric'],
             'lng' => ['nullable', 'numeric'],
             'sort' => ['nullable', 'integer', 'min:0'],
diff --git a/database/migrations/2026_04_23_120000_widen_contact_phone_to_255.php b/database/migrations/2026_04_23_120000_widen_contact_phone_to_255.php
new file mode 100644
index 0000000..78a8af9
--- /dev/null
+++ b/database/migrations/2026_04_23_120000_widen_contact_phone_to_255.php
@@ -0,0 +1,50 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        if (! Schema::hasColumn('venues', 'contact_phone') || ! Schema::hasColumn('activities', 'contact_phone')) {
+            return;
+        }
+
+        $driver = Schema::getConnection()->getDriverName();
+
+        if ($driver === 'mysql') {
+            DB::statement('ALTER TABLE `venues` MODIFY `contact_phone` VARCHAR(255) NULL');
+            DB::statement('ALTER TABLE `activities` MODIFY `contact_phone` VARCHAR(255) NULL');
+
+            return;
+        }
+
+        if ($driver === 'pgsql') {
+            DB::statement('ALTER TABLE venues ALTER COLUMN contact_phone TYPE VARCHAR(255)');
+            DB::statement('ALTER TABLE activities ALTER COLUMN contact_phone TYPE VARCHAR(255)');
+        }
+    }
+
+    public function down(): void
+    {
+        if (! Schema::hasColumn('venues', 'contact_phone') || ! Schema::hasColumn('activities', 'contact_phone')) {
+            return;
+        }
+
+        $driver = Schema::getConnection()->getDriverName();
+
+        if ($driver === 'mysql') {
+            DB::statement('ALTER TABLE `venues` MODIFY `contact_phone` VARCHAR(64) NULL');
+            DB::statement('ALTER TABLE `activities` MODIFY `contact_phone` VARCHAR(64) NULL');
+
+            return;
+        }
+
+        if ($driver === 'pgsql') {
+            DB::statement('ALTER TABLE venues ALTER COLUMN contact_phone TYPE VARCHAR(64)');
+            DB::statement('ALTER TABLE activities ALTER COLUMN contact_phone TYPE VARCHAR(64)');
+        }
+    }
+};