diff --git a/data/class/pages/admin/basis/LC_Page_Admin_Basis_Holiday.php b/data/class/pages/admin/basis/LC_Page_Admin_Basis_Holiday.php
index aba3c8424a..73307836ed 100644
--- a/data/class/pages/admin/basis/LC_Page_Admin_Basis_Holiday.php
+++ b/data/class/pages/admin/basis/LC_Page_Admin_Basis_Holiday.php
@@ -88,7 +88,7 @@ public function action()
             // 編集処理
             case 'edit':
                 $this->arrErr = $this->lfCheckError($objFormParam, $objHoliday);
-                if (!SC_Utils_Ex::isBlank($this->arrErr['holiday_id'])) {
+                if (!SC_Utils_Ex::isBlank($this->arrErr['holiday_id'] ?? '')) {
                     trigger_error('', E_USER_ERROR);
 
                     return;
@@ -201,7 +201,11 @@ public function lfCheckError(&$objFormParam, SC_Helper_Holiday_Ex &$objHoliday)
         if ($arrForm['month'] == 2 && $arrForm['day'] == 29) {
             $valid_date = true;
         } else {
-            $valid_date = checkdate($arrForm['month'], $arrForm['day'], date('Y'));
+            if (SC_Utils_Ex::isBlank($arrForm['month']) || SC_Utils_Ex::isBlank($arrForm['day'])) {
+                $valid_date = false;
+            } else {
+                $valid_date = checkdate($arrForm['month'], $arrForm['day'], date('Y'));
+            }
         }
         if (!$valid_date) {
             $arrErr['date'] = '※ 妥当な日付ではありません。<br />';
diff --git a/e2e-tests/test/admin/basis/holiday.test.ts b/e2e-tests/test/admin/basis/holiday.test.ts
new file mode 100644
index 0000000000..6ff211f35a
--- /dev/null
+++ b/e2e-tests/test/admin/basis/holiday.test.ts
@@ -0,0 +1,62 @@
+import { test, expect } from '../../../fixtures/admin_login.fixture';
+import { ADMIN_DIR } from '../../../config/default.config';
+import { faker } from '@faker-js/faker/locale/ja';
+
+const url = `/${ ADMIN_DIR }/basis/holiday.php`;
+test.describe('定休日管理画面のテストをします', () => {
+
+  test('定休日管理画面のテストをします', async ( { adminLoginPage, page }) => {
+    await page.goto(url);
+    await expect(page.locator('h1')).toContainText(/定休日管理/);
+  });
+
+  test('エラーハンドリングのテストをします', async ( { adminLoginPage, page }) => {
+    await page.goto(url);
+    expect(page.getByRole('row', { name: 'タイトル' }).getByRole('textbox')).toBeEmpty();
+    await expect(page.getByRole('row', { name: '日付' }).locator('select[name=month]')).toHaveValue('');
+    await expect(page.getByRole('row', { name: '日付' }).locator('select[name=day]')).toHaveValue('');
+    await page.getByRole('link', { name: 'この内容で登録する' }).click();
+    await expect(page.getByText('タイトルが入力されていません。')).toBeVisible();
+    await expect(page.getByText('妥当な日付ではありません。')).toBeVisible();
+  });
+
+  test('定休日の登録をします', async ( { adminLoginPage, page }) => {
+    page.on('dialog', dialog => dialog.accept());
+    await page.goto(url);
+
+    const title = faker.lorem.sentence();
+    await test.step('登録処理をします', async () => {
+      await page.getByRole('row', { name: 'タイトル' }).getByRole('textbox').fill(title);
+      await page.getByRole('row', { name: '日付' }).locator('select[name=month]').selectOption({ value: String(faker.number.int({ min: 1, max: 12 })) });
+      await page.getByRole('row', { name: '日付' }).locator('select[name=day]').selectOption({ value: String(faker.number.int({ min: 1, max: 28 })) });
+
+      await page.getByRole('link', { name: 'この内容で登録する' }).click();
+      await expect(page.locator('table.list')).toContainText(title);
+    });
+    await test.step('登録処理をします', async () => {
+      await page.getByRole('row', { name: 'タイトル' }).getByRole('textbox').fill(title);
+      await page.getByRole('row', { name: '日付' }).locator('select[name=month]').selectOption({ value: String(faker.number.int({ min: 1, max: 12 })) });
+      await page.getByRole('row', { name: '日付' }).locator('select[name=day]').selectOption({ value: String(faker.number.int({ min: 1, max: 28 })) });
+
+      await page.getByRole('link', { name: 'この内容で登録する' }).click();
+      await expect(page.locator('table.list')).toContainText(title);
+    });
+
+    await test.step('編集をします', async () => {
+      await page.goto(url);
+      await page.getByRole('row', { name: title }).getByRole('link', { name: '編集' }).click();
+      await page.getByRole('row', { name: 'タイトル' }).getByRole('textbox').fill(`${title}を編集`);
+      await page.getByRole('row', { name: '日付' }).locator('select[name=month]').selectOption({ value: String(faker.number.int({ min: 1, max: 12 })) });
+      await page.getByRole('row', { name: '日付' }).locator('select[name=day]').selectOption({ value: String(faker.number.int({ min: 1, max: 28 })) });
+
+      await page.getByRole('link', { name: 'この内容で登録する' }).click();
+      await expect(page.locator('table.list')).toContainText(`${title}を編集`);
+    });
+
+    await test.step('削除をします', async () => {
+      await page.goto(url);
+      await page.getByRole('row', { name: `${title}を編集` }).getByRole('link', { name: '削除' }).click();
+      await expect(page.locator('table.list')).not.toContainText(`${title}を編集`);
+    });
+  });
+});