diff --git a/src/lib/components/TabItemWrapper.svelte b/src/lib/components/TabItemWrapper.svelte
index 7b2f284ec..1dfbbed1a 100644
--- a/src/lib/components/TabItemWrapper.svelte
+++ b/src/lib/components/TabItemWrapper.svelte
@@ -6,11 +6,16 @@
 
   import { WorkBookType } from '$lib/types/workbook';
   import { activeWorkbookTabStore } from '$lib/stores/active_workbook_tab';
+  import {
+    activeProblemListTabStore,
+    type ActiveProblemListTab,
+  } from '$lib/stores/active_problem_list_tab.svelte';
 
   import { TOOLTIP_CLASS_BASE } from '$lib/constants/tailwind-helper';
 
   interface Props {
-    workbookType: WorkBookType | null;
+    workbookType?: WorkBookType | null;
+    activeProblemList?: ActiveProblemListTab | null;
     isOpen?: boolean;
     title: string;
     tooltipContent?: string;
@@ -19,6 +24,7 @@
 
   let {
     workbookType = null,
+    activeProblemList = null,
     isOpen = false,
     title,
     tooltipContent = '',
@@ -31,10 +37,17 @@
     titleId = `title-${Math.floor(Math.random() * 10000)}`;
   });
 
-  function handleClick(workBookType: WorkBookType | null): void {
-    if (workBookType === null) return;
+  function handleClick(
+    workBookType: WorkBookType | null,
+    activeProblemList: ActiveProblemListTab | null,
+  ): void {
+    if (workBookType !== null) {
+      activeWorkbookTabStore.setActiveWorkbookTab(workBookType);
+    }
 
-    activeWorkbookTabStore.setActiveWorkbookTab(workBookType);
+    if (activeProblemList !== null) {
+      activeProblemListTabStore.set(activeProblemList);
+    }
   }
 </script>
 
@@ -54,7 +67,7 @@
 
 <!-- See: -->
 <!-- https://svelte-5-ui-lib.codewithshin.com/components/tabs -->
-<TabItem open={isOpen} onclick={() => handleClick(workbookType)}>
+<TabItem open={isOpen} onclick={() => handleClick(workbookType, activeProblemList)}>
   {#snippet titleSlot()}
     <span class="text-lg" id={titleId}>
       <div class="flex items-center space-x-2">
diff --git a/src/lib/stores/active_problem_list_tab.svelte.ts b/src/lib/stores/active_problem_list_tab.svelte.ts
new file mode 100644
index 000000000..e40f1b125
--- /dev/null
+++ b/src/lib/stores/active_problem_list_tab.svelte.ts
@@ -0,0 +1,52 @@
+export type ActiveProblemListTab = 'contestTable' | 'listByGrade' | 'gradeGuidelineTable';
+
+export class ActiveProblemListTabStore {
+  value = $state<ActiveProblemListTab>('listByGrade');
+
+  /**
+   * Creates an instance with the specified problem list tab.
+   *
+   * @param activeTab - The default problem list tab to initialize.
+   * Defaults to 'listByGrade'.
+   */
+  constructor(activeTab: ActiveProblemListTab = 'listByGrade') {
+    this.value = activeTab;
+  }
+
+  /**
+   * Gets the current active tab.
+   *
+   * @returns The current active tab.
+   */
+  get(): ActiveProblemListTab {
+    return this.value;
+  }
+
+  /**
+   * Sets the current tab to the specified value.
+   *
+   * @param activeTab - The active tab to set as the current value
+   */
+  set(activeTab: ActiveProblemListTab): void {
+    this.value = activeTab;
+  }
+
+  /**
+   * Validates if the current tab matches the task list.
+   * @param activeTab - The active tab to compare against
+   * @returns `true` if the active tab matches the task list, `false` otherwise
+   */
+  isSame(activeTab: ActiveProblemListTab): boolean {
+    return this.value === activeTab;
+  }
+
+  /**
+   * Resets the active tab to the default value.
+   * Sets the internal value to 'listByGrade'.
+   */
+  reset(): void {
+    this.value = 'listByGrade';
+  }
+}
+
+export const activeProblemListTabStore = new ActiveProblemListTabStore();
diff --git a/src/routes/problems/+page.svelte b/src/routes/problems/+page.svelte
index 4c0ce8bd1..04d403b37 100644
--- a/src/routes/problems/+page.svelte
+++ b/src/routes/problems/+page.svelte
@@ -1,4 +1,6 @@
 <script lang="ts">
+  import type { Snippet } from 'svelte';
+
   import { Tabs } from 'svelte-5-ui-lib';
 
   import type { TaskResults } from '$lib/types/task';
@@ -11,12 +13,21 @@
   import TaskGradeList from '$lib/components/TaskGradeList.svelte';
   import GradeGuidelineTable from '$lib/components/TaskGrades/GradeGuidelineTable.svelte';
 
+  import {
+    activeProblemListTabStore,
+    type ActiveProblemListTab,
+  } from '$lib/stores/active_problem_list_tab.svelte';
+
   let { data } = $props();
 
   let taskResults: TaskResults = $derived(data.taskResults.sort(compareByContestIdAndTaskId));
 
   let isAdmin: boolean = data.isAdmin;
   let isLoggedIn: boolean = data.isLoggedIn;
+
+  function isActiveTab(currentTab: ActiveProblemListTab): boolean {
+    return currentTab === activeProblemListTabStore.get();
+  }
 </script>
 
 <!-- TODO: Searchを追加 -->
@@ -26,29 +37,35 @@
   <!-- See: -->
   <!-- https://flowbite-svelte.com/docs/components/tabs -->
   <Tabs tabStyle="underline" contentClass="bg-white dark:bg-gray-800 mt-0 p-0">
-    <!-- Task table -->
+    <!-- Contest table -->
     <!-- WIP: UIのデザインが試行錯誤の段階であるため、管理者のみ閲覧可能 -->
     <!-- TODO: 一般公開するときに、デフォルトで開くタブにする -->
     {#if isAdmin}
-      <TabItemWrapper workbookType={null} title="テーブル">
-        <TaskTable {taskResults} {isLoggedIn} />
-      </TabItemWrapper>
+      {@render problemListTab('テーブル', 'contestTable', contestTable)}
     {/if}
 
     <!-- Grades -->
-    <TabItemWrapper workbookType={null} isOpen={true} title="グレード">
-      <TaskGradeList {taskResults} {isAdmin} {isLoggedIn}></TaskGradeList>
-    </TabItemWrapper>
+    {@render problemListTab('グレード', 'listByGrade', listByGrade)}
 
     <!-- Grade guidelines -->
-    <TabItemWrapper workbookType={null} title="グレードの目安">
-      <GradeGuidelineTable />
-    </TabItemWrapper>
-
-    <!-- HACK: 以下、各テーブルを実装するまで非表示 -->
-    <!-- Tags -->
-    <!-- <TabItemWrapper title="Tags">
-      <div class="m-4">Comming Soon.</div>
-    </TabItemWrapper> -->
+    {@render problemListTab('グレードの目安', 'gradeGuidelineTable', gradeGuidelineTable)}
   </Tabs>
 </div>
+
+{#snippet problemListTab(title: string, tab: ActiveProblemListTab, children: Snippet)}
+  <TabItemWrapper {title} activeProblemList={tab} isOpen={isActiveTab(tab)}>
+    {@render children()}
+  </TabItemWrapper>
+{/snippet}
+
+{#snippet contestTable()}
+  <TaskTable {taskResults} {isLoggedIn} />
+{/snippet}
+
+{#snippet listByGrade()}
+  <TaskGradeList {taskResults} {isAdmin} {isLoggedIn}></TaskGradeList>
+{/snippet}
+
+{#snippet gradeGuidelineTable()}
+  <GradeGuidelineTable />
+{/snippet}
diff --git a/src/test/lib/stores/active_problem_list_tab.svelte.test.ts b/src/test/lib/stores/active_problem_list_tab.svelte.test.ts
new file mode 100644
index 000000000..a1a09dd1f
--- /dev/null
+++ b/src/test/lib/stores/active_problem_list_tab.svelte.test.ts
@@ -0,0 +1,61 @@
+import { describe, test, expect, beforeEach } from 'vitest';
+
+import { ActiveProblemListTabStore } from '$lib/stores/active_problem_list_tab.svelte';
+
+describe('ActiveProblemListTabStore', () => {
+  let store: ActiveProblemListTabStore;
+
+  beforeEach(() => {
+    store = new ActiveProblemListTabStore();
+  });
+
+  describe('constructor', () => {
+    test('expects to initialize with default value', () => {
+      expect(store.get()).toBe('listByGrade');
+    });
+
+    test('expects to initialize with provided value', () => {
+      const customStore = new ActiveProblemListTabStore('contestTable');
+      expect(customStore.get()).toBe('contestTable');
+    });
+  });
+
+  describe('get', () => {
+    test('expects to return the current active tab', () => {
+      expect(store.get()).toBe('listByGrade');
+    });
+  });
+
+  describe('set', () => {
+    test('expects to update the active tab value', () => {
+      store.set('contestTable');
+      expect(store.get()).toBe('contestTable');
+
+      store.set('gradeGuidelineTable');
+      expect(store.get()).toBe('gradeGuidelineTable');
+    });
+  });
+
+  describe('isSame', () => {
+    test('expects to return true when active tab matches the argument', () => {
+      store.set('contestTable');
+      expect(store.isSame('contestTable')).toBe(true);
+    });
+
+    test('expects to return false when active tab does not match the argument', () => {
+      store.set('contestTable');
+      expect(store.isSame('listByGrade')).toBe(false);
+      expect(store.isSame('gradeGuidelineTable')).toBe(false);
+    });
+  });
+
+  describe('reset', () => {
+    test('expects to reset the active tab to the default value', () => {
+      store.set('contestTable');
+      expect(store.get()).toBe('contestTable');
+
+      store.reset();
+      expect(store.get()).toBe('listByGrade');
+    });
+  });
+});