diff --git a/src/q1-type-definition/UserCard.tsx b/src/q1-type-definition/UserCard.tsx
index 0209cc2..f19dad0 100644
--- a/src/q1-type-definition/UserCard.tsx
+++ b/src/q1-type-definition/UserCard.tsx
@@ -34,9 +34,59 @@ import React from "react";
 
 // ↓↓↓ ここに UserCardProps 型の定義と UserCard コンポーネントを実装してください ↓↓↓
 
-export const UserCard = () => {
-  // TODO: 実装してください
-  return null;
+// 権限 （Union Types）
+type Role = "admin" | "editor" | "viewer";
+
+// 権限: {ロール日本語名}
+const roleLabel: Record<Role, string> = {
+  admin:  "管理者",
+  editor: "編集者",
+  viewer: "閲覧者",
+};
+
+
+type UserCardProps = {
+  name: string;
+  age: number;
+  email?: string;
+  role:Role;
+  skills:string[];
+  onContact?: (email:string) => void;
 };
 
+
+export const UserCard = ({
+  name,
+  age,
+  email,
+  role,
+  skills,
+  onContact
+}: UserCardProps) => {
+  // TODO: 実装してください
+  return (
+    <div>
+    <h2 data-testid="name">{name}</h2>
+    <p data-testid="age">年齢: {age}</p>
+    <p data-testid="role">権限: {roleLabel[role]}</p>
+    {email && (
+    <p data-testid="email">Email: {email}</p>
+    )}
+    
+    <ul data-testid="skills">
+      {skills.map((skill, index) => (
+        <li key={index}>{skill}</li>
+      ))}
+    </ul>
+    {email && onContact && (
+      <button data-testid="contact-btn"
+        onClick = {() => onContact(email)}
+      >
+      コンタクト
+      </button>
+      )
+    }
+    </div>
+  );
+};
 // ↑↑↑ ここまで ↑↑↑
diff --git a/src/q2-hooks-basics/UserList.tsx b/src/q2-hooks-basics/UserList.tsx
index 4e0d8b2..fa65eb0 100644
--- a/src/q2-hooks-basics/UserList.tsx
+++ b/src/q2-hooks-basics/UserList.tsx
@@ -37,9 +37,49 @@ export const fetchUsers = async (): Promise<User[]> => {
 
 // ↓↓↓ ここに UserList コンポーネントを実装してください ↓↓↓
 
+// 3つの状態
+type State = 
+| { status: "loading" }
+| { status: "error" }
+| { status: "success"; data: User[]};
+
+
 export const UserList: React.FC = () => {
   // TODO: 実装してください
-  return null;
+  const [state, setState] = useState<State>({status: "loading"});
+
+  useEffect(() => {
+    const load = async () => {
+      try {
+        const users = await fetchUsers();
+        setState({status: "success", data: users});
+      } catch {
+        setState({status: "error"});
+      }
+    };
+
+    load();
+  }, []);
+
+  if(state.status === "loading") {
+    return <p data-testid="loading">読み込み中...</p>
+  }
+
+  if(state.status === "error") {
+    return <p data-testid="error">エラーが発生しました</p>
+  }
+
+  if(state.data.length === 0 ){
+    return <p data-testid="empty">ユーザーがいません</p>
+  }
+
+  return (
+    <ul data-testid="user-list">
+      {state.data.map((user) => (
+        <li key={user.id} data-testid={`user-${user.id}`}>{user.name} - {user.department}</li>
+      ))}
+    </ul>
+  );
 };
 
 // ↑↑↑ ここまで ↑↑↑
diff --git a/src/q3-custom-hook/useForm.ts b/src/q3-custom-hook/useForm.ts
index 980926b..ebb1bcc 100644
--- a/src/q3-custom-hook/useForm.ts
+++ b/src/q3-custom-hook/useForm.ts
@@ -56,7 +56,106 @@ export function useForm<T extends Record<string, any>>(
   rules: ValidationRules<T> = {}
 ): UseFormReturn<T> {
   // TODO: 実装してください
-  throw new Error("Not implemented");
+  const [values, setValues] = useState<T> ({...initialValues});
+  const [errors, setErrors] = useState<Partial<Record<keyof T,string>>> ({});
+  const [touched, setTouchedState] = useState<Partial<Record<keyof T, boolean>>> ({});
+
+
+  const validateField = useCallback(
+    <K extends keyof T>(field: K, currentValues: T): string | null => {
+      const fieldRules = rules[field];
+      if(!fieldRules || fieldRules.length === 0) return null;
+
+      for(const rule of fieldRules){
+        const result = rule(currentValues[field]);
+        if(result != null) return result;
+      }
+      return null;
+    },
+    [rules] 
+  );
+
+
+  const applyFieldError = useCallback(
+    (
+      prev: Partial<Record<keyof T, string>>,
+      field: keyof T,
+      error: string | null
+    ): Partial<Record<keyof T, string>> => {
+      const next = { ...prev };
+      if(error != null ){
+        next[field] = error;
+      } else {
+        delete next[field];
+      }
+      return next;
+    },
+    []
+  );
+
+
+  const setValue = useCallback(
+    <K extends keyof T>(field: K, value: T[K]) => {
+        setValues((prev) => ({ ...prev, [field]: value}));
+
+        if(touched[field]) {
+          const error = validateField(field, {[field]: value} as T);
+          setErrors((prev) => applyFieldError(prev, field, error));
+        }
+   },
+    [touched, validateField, applyFieldError]
+  );
+
+
+  const setTouched = useCallback(
+    <K extends keyof T>(field: K) => {
+      setTouchedState((prev) => ({...prev, [field]: true }));
+
+      const error = validateField(field, values);
+      setErrors((prev) => applyFieldError(prev,field, error));
+    },
+    [values, validateField, applyFieldError]
+  );
+
+ 
+  const validate = useCallback((): boolean =>  {
+      const allFileds = Object.keys(rules) as (keyof T)[];
+      let nextErrors: Partial<Record<keyof T, string>> = {};
+
+      for(const field of allFileds){
+        const error = validateField(field, values);
+        if(error != null) {
+          nextErrors[field] = error;
+        }
+      }
+
+      setErrors(nextErrors);
+      return Object.keys(nextErrors).length ===0;
+    },
+    [rules, values, validateField]
+  );
+
+
+  const reset = useCallback(() =>{
+    setValues({...initialValues});
+    setErrors({});
+    setTouchedState({}); 
+    },
+    [initialValues]
+  );
+
+  const isValid = Object.keys(errors).length === 0;
+
+  return {
+    values,
+    errors,
+    touched,
+    setValue,
+    setTouched,
+    validate,
+    reset,
+    isValid,
+  };
 }
 
 // ↑↑↑ ここまで ↑↑↑
diff --git a/src/q4-refactor/TaskManager.tsx b/src/q4-refactor/TaskManager.tsx
index 509609f..44eed19 100644
--- a/src/q4-refactor/TaskManager.tsx
+++ b/src/q4-refactor/TaskManager.tsx
@@ -16,11 +16,55 @@
  * - default export すること
  */
 
-import React from "react";
+import React, { useState } from "react";
+import { Task, Priority, Filter } from "./types";
+import TaskForm from "./components/TaskForm";
+import TaskFilter from "./components/TaskFilter";
+import TaskList from "./components/TaskList";
+
+
 
 const TaskManager: React.FC = () => {
-  // TODO: 実装してください
-  return null;
+  const [tasks, setTasks] = useState<Task[]>([]);
+  const [filter, setFilter] = useState<Filter>("all");
+  const [nextId, setNextId] = useState(1);
+
+  const addTask = (title: string, priority: Priority) => {
+    setTasks([...tasks, { id: nextId, title, completed: false, priority }]);
+    setNextId(nextId + 1);
+  };
+
+  const toggleTask = (id: number) => {
+    setTasks(tasks.map((t) => (t.id === id ? { ...t, completed: !t.completed } : t)));
+  };
+
+  const deleteTask = (id: number) => {
+    setTasks(tasks.filter((t) => t.id !== id));
+  };
+
+  const filteredTasks = tasks.filter((t) => {
+    if (filter === "active") return !t.completed;
+    if (filter === "completed") return t.completed;
+    return true;
+  });
+
+  const stats = {
+    total: tasks.length,
+    active: tasks.filter((t) => !t.completed).length,
+    completed: tasks.filter((t) => t.completed).length,
+  };
+
+  return (
+    <div>
+      <h1>タスク管理</h1>
+      <div data-testid="stats">
+        全体: {stats.total} / 未完了: {stats.active} / 完了: {stats.completed}
+      </div>
+      <TaskForm onAdd={addTask} />
+      <TaskFilter current={filter} onChange={setFilter} />
+      <TaskList tasks={filteredTasks} onToggle={toggleTask} onDelete={deleteTask} />
+    </div>
+  );
 };
 
 export default TaskManager;
diff --git a/src/q4-refactor/components/TaskFilter.tsx b/src/q4-refactor/components/TaskFilter.tsx
index 09866ca..eb14abb 100644
--- a/src/q4-refactor/components/TaskFilter.tsx
+++ b/src/q4-refactor/components/TaskFilter.tsx
@@ -13,3 +13,43 @@
  * - ラベル: "すべて" / "未完了" / "完了"
  * - 現在選択中のフィルターは fontWeight: "bold"
  */
+
+import { Filter } from "../types";
+
+// フィルターボタン
+// 要件: 
+// - 3つのボタン: data-testid="filter-all" / "filter-active" / "filter-completed"
+// - ラベル: "すべて" / "未完了" / "完了"
+const FILTER_OPTIONS: { value: Filter; label: string; testId: string }[] = [
+  { value: "all",       label: "すべて", testId: "filter-all"       },
+  { value: "active",    label: "未完了", testId: "filter-active"    },
+  { value: "completed", label: "完了",   testId: "filter-completed" },
+];
+
+// 
+interface TaskFilterProps {
+  current: Filter;
+  onChange: (filter: Filter) => void;
+}
+
+const TaskFilter: React.FC<TaskFilterProps> = ({ current, onChange }) => {
+  return (
+    <div data-testid="task-filter">
+      {FILTER_OPTIONS.map(({ value, label, testId }) => (
+        <button
+          key={value}
+          data-testid={testId}
+          onClick={() => onChange(value)}
+          style={{
+            fontWeight: current === value ? "bold" : "normal",
+          }}
+        >
+          {label}
+        </button>
+      ))}
+    </div>
+  );
+};
+
+export {TaskFilter};
+export default TaskFilter;
\ No newline at end of file
diff --git a/src/q4-refactor/components/TaskForm.tsx b/src/q4-refactor/components/TaskForm.tsx
index 875fa16..2121302 100644
--- a/src/q4-refactor/components/TaskForm.tsx
+++ b/src/q4-refactor/components/TaskForm.tsx
@@ -17,3 +17,38 @@
  * - <button data-testid="add-btn">追加</button>
  * - 追加後、input は空文字、select は "medium" にリセット
  */
+import { useState } from "react";
+import { Priority } from "../types";
+
+interface TaskFormProps {
+  onAdd: (title: string, priority: Priority) => void;
+}
+
+const TaskForm: React.FC<TaskFormProps> = ({ onAdd }) => {
+  const [title, setTitle] = useState("");
+  const [priority, setPriority] = useState<Priority>("medium");
+
+  const handleAdd = () => {
+    if (!title.trim()) return;
+    onAdd(title.trim(), priority);
+    
+    //要件: - 追加後、input は空文字、select は "medium" にリセット
+    setTitle("");
+    setPriority("medium");
+  };
+
+  return (
+    <div data-testid="task-form">
+      <input data-testid="title-input" value={title} onChange={(e) => setTitle(e.target.value)} placeholder="タスク入力" />
+      <select data-testid="priority-select" value={priority} onChange={(e) => setPriority(e.target.value as Priority)}>
+        <option value="high">高</option>
+        <option value="medium">中</option>
+        <option value="low">低</option>
+      </select>
+      <button data-testid="add-btn" onClick={handleAdd}>追加</button>
+    </div>
+  );
+};
+
+export {TaskForm};
+export default TaskForm;
diff --git a/src/q4-refactor/components/TaskItem.tsx b/src/q4-refactor/components/TaskItem.tsx
index a856a69..ceff0a4 100644
--- a/src/q4-refactor/components/TaskItem.tsx
+++ b/src/q4-refactor/components/TaskItem.tsx
@@ -15,3 +15,25 @@
  * - 優先度: data-testid={`priority-${task.id}`} → [{task.priority}]
  * - 削除ボタン: data-testid={`delete-${task.id}`}
  */
+
+import { Task } from "../types";
+
+interface TaskItemProps {
+  task: Task;
+  onToggle: (id: number) => void;
+  onDelete: (id: number) => void;
+}
+
+const TaskItem: React.FC<TaskItemProps> = ({ task, onToggle, onDelete }) => {
+  return (
+    <li data-testid={`task-${task.id}`}>
+      <input type="checkbox" data-testid={`toggle-${task.id}`} checked={task.completed} onChange={() => onToggle(task.id)} />
+      <span data-testid={`title-${task.id}`} style={{ textDecoration: task.completed ? "line-through" : "none" }}>{task.title}</span>
+      <span data-testid={`priority-${task.id}`}>[{task.priority}]</span>
+      <button data-testid={`delete-${task.id}`} onClick={() => onDelete(task.id)}>削除</button>
+    </li>
+  );
+};
+
+export {TaskItem}
+export default TaskItem;
diff --git a/src/q4-refactor/components/TaskList.tsx b/src/q4-refactor/components/TaskList.tsx
index 667e20b..20be899 100644
--- a/src/q4-refactor/components/TaskList.tsx
+++ b/src/q4-refactor/components/TaskList.tsx
@@ -12,3 +12,24 @@
  * - <ul data-testid="task-list"> で囲む
  * - 各タスクを TaskItem で表示
  */
+import { Task } from "../types";
+import TaskItem from "./TaskItem";
+
+interface TaskListProps {
+  tasks: Task[];
+  onToggle: (id: number) => void;
+  onDelete: (id: number) => void;
+}
+
+const TaskList: React.FC<TaskListProps> = ({ tasks, onToggle, onDelete }) => {
+  return (
+    <ul data-testid="task-list">
+      {tasks.map((task) => (
+        <TaskItem key={task.id} task={task} onToggle={onToggle} onDelete={onDelete} />
+      ))}
+    </ul>
+  );
+};
+
+export {TaskList}
+export default TaskList;
diff --git a/src/q4-refactor/types.ts b/src/q4-refactor/types.ts
index 5b586f2..ac792f7 100644
--- a/src/q4-refactor/types.ts
+++ b/src/q4-refactor/types.ts
@@ -6,3 +6,13 @@
  * - Filter: "all" | "active" | "completed"
  * - Task: { id, title, completed, priority }
  */
+
+export type Priority = "high" | "medium" | "low";
+export type Filter = "all" | "active" | "completed";
+
+export interface Task {
+  id: number;
+  title: string;
+  completed: boolean;
+  priority: Priority;
+}
\ No newline at end of file