diff --git a/src/main/java/com/example/demo/controller/BookUpdateConfirmController.java b/src/main/java/com/example/demo/controller/BookUpdateConfirmController.java
new file mode 100644
index 0000000..19c39fb
--- /dev/null
+++ b/src/main/java/com/example/demo/controller/BookUpdateConfirmController.java
@@ -0,0 +1,13 @@
+package com.example.demo.controller;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PostMapping;
+
+@Controller
+public class BookUpdateConfirmController {
+	
+	@PostMapping("/updateconfirm")
+	public String updateConfirm() {
+		return "updateconfirm";
+	}
+}
diff --git a/src/main/java/com/example/demo/controller/BookUpdateController.java b/src/main/java/com/example/demo/controller/BookUpdateController.java
new file mode 100644
index 0000000..bb6aad5
--- /dev/null
+++ b/src/main/java/com/example/demo/controller/BookUpdateController.java
@@ -0,0 +1,19 @@
+package com.example.demo.controller;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PostMapping;
+
+@Controller
+public class BookUpdateController {
+
+	@PostMapping("/update")
+	public String update() {
+		return "update";
+	}
+	
+	@PostMapping("/bookUpdate")
+	public String bookUpdate() {
+		return "book";
+	}
+	
+}
diff --git a/src/main/java/com/example/demo/controller/LoginController.java b/src/main/java/com/example/demo/controller/LoginController.java
index 7961482..4e469fc 100644
--- a/src/main/java/com/example/demo/controller/LoginController.java
+++ b/src/main/java/com/example/demo/controller/LoginController.java
@@ -1,24 +1,79 @@
 package com.example.demo.controller;
 
+import jakarta.servlet.http.HttpSession;
+import jakarta.validation.Valid;
+
 import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.validation.BindingResult;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.ModelAttribute;
 import org.springframework.web.bind.annotation.PostMapping;
 
+import com.example.demo.entity.AccountEntity;
+import com.example.demo.form.LoginForm;
+import com.example.demo.service.LoginService;
+
+import lombok.RequiredArgsConstructor;
+
 @Controller
+@RequiredArgsConstructor
 public class LoginController {
 
-    @GetMapping("/login")
-    public String showLogin() {
-        return "login";
-    }
+	private final LoginService loginService;
 
-    @PostMapping("/doLogin")
-    public String doLogin() {
-        return "redirect:/topmenu";
-    }
+	// Boot起動直後にログイン画面に移動する用のメソッド
+	@GetMapping("/")
+	public String index(HttpSession session) {
+		if (session.getAttribute("loginEmployee") != null) {
+			return "redirect:/topmenu";
+		}
+		return "redirect:/login";
+	}
 
-    @GetMapping("/topmenu")
-    public String showTopMenu() {
-        return "topmenu";
-    }
+	@GetMapping("/login")
+	public String loginForm(Model model, HttpSession session) {
+		if (session.getAttribute("loginEmployee") != null) {
+			return "redirect:/topmenu";
+		}
+
+		model.addAttribute("loginForm", new LoginForm());
+		return "login";
+	}
+
+	// 実際のログイン処理
+	@PostMapping("/login")
+	public String doLogin(
+			@Valid @ModelAttribute LoginForm loginForm,
+			BindingResult bindingResult,
+			Model model,
+			HttpSession session) {
+
+		if (bindingResult.hasErrors()) {
+			return "login";
+		}
+
+		AccountEntity accountEntity = loginService.login(loginForm);
+		if (accountEntity == null) {
+			model.addAttribute("loginError",
+					"ログインIDまたはパスワードが正しくありません");
+			return "login";
+		}
+
+		session.setAttribute("loginEmployee", accountEntity);
+		return "redirect:/topmenu";
+	}
+	
+	// ログアウト処理
+	@GetMapping("/logout")
+	public String logout(HttpSession session) {
+		session.invalidate();
+		return "redirect:/login";
+	}
+
+	// 各画面からトップメニューへの遷移用
+	@GetMapping("/topmenu")
+	public String showTopMenu() {
+		return "topmenu";
+	}
 }
\ No newline at end of file
diff --git a/src/main/java/com/example/demo/entity/AccountEntity.java b/src/main/java/com/example/demo/entity/AccountEntity.java
new file mode 100644
index 0000000..fc90022
--- /dev/null
+++ b/src/main/java/com/example/demo/entity/AccountEntity.java
@@ -0,0 +1,40 @@
+package com.example.demo.entity;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+/*
+ * accountテーブル用のEntityクラス
+ * ログイン時やセッションでの管理者判別に使う
+ */
+
+@Entity
+@Table(name = "account")
+@Getter
+@Setter
+@NoArgsConstructor
+public class AccountEntity {
+
+	@Id
+	@GeneratedValue(strategy = GenerationType.IDENTITY)
+	@Column(name="login_info_id")
+	private Integer loginInfoId;
+	
+	@Column(name="employee_id")
+	private Integer employeeId;
+	
+	@Column(name="password_hash")
+	private String passwordHash;
+	
+	@Column(name="admin_flag")
+	private int adminFlag;
+	
+}
diff --git a/src/main/java/com/example/demo/form/LoginForm.java b/src/main/java/com/example/demo/form/LoginForm.java
new file mode 100644
index 0000000..2a5a7ab
--- /dev/null
+++ b/src/main/java/com/example/demo/form/LoginForm.java
@@ -0,0 +1,17 @@
+package com.example.demo.form;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+
+import lombok.Data;
+
+@Data
+public class LoginForm {
+
+	@NotNull(message = "社員IDを入力してください")
+	private Integer employeeId;
+
+	@NotBlank(message = "パスワードを入力してください")
+	private String passwordHash;
+
+}
diff --git a/src/main/java/com/example/demo/repository/AccountRepository.java b/src/main/java/com/example/demo/repository/AccountRepository.java
new file mode 100644
index 0000000..db7d155
--- /dev/null
+++ b/src/main/java/com/example/demo/repository/AccountRepository.java
@@ -0,0 +1,11 @@
+package com.example.demo.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.example.demo.entity.AccountEntity;
+
+public interface AccountRepository extends JpaRepository<AccountEntity,Integer>{
+	
+	AccountEntity findByEmployeeId (Integer employeeId);
+
+}
diff --git a/src/main/java/com/example/demo/service/LoginService.java b/src/main/java/com/example/demo/service/LoginService.java
new file mode 100644
index 0000000..c87eead
--- /dev/null
+++ b/src/main/java/com/example/demo/service/LoginService.java
@@ -0,0 +1,31 @@
+package com.example.demo.service;
+
+import org.springframework.stereotype.Service;
+
+import com.example.demo.entity.AccountEntity;
+import com.example.demo.form.LoginForm;
+import com.example.demo.repository.AccountRepository;
+
+import lombok.RequiredArgsConstructor;
+
+@Service
+@RequiredArgsConstructor
+public class LoginService {
+	
+	private final AccountRepository accountRepository;
+	
+	public AccountEntity login(LoginForm form) {
+		AccountEntity accountEntity = 
+				accountRepository.findByEmployeeId(form.getEmployeeId());
+		
+		if(accountEntity == null) {
+			return null;
+		}
+		
+		if(!accountEntity.getPasswordHash().equals(form.getPasswordHash()))
+			return null;
+		
+		return accountEntity;
+	}
+
+}
diff --git a/src/main/resources/templates/login.html b/src/main/resources/templates/login.html
index 06b4373..70f5aac 100644
--- a/src/main/resources/templates/login.html
+++ b/src/main/resources/templates/login.html
@@ -1,29 +1,35 @@
 <!DOCTYPE html>
-<html>
+<html xmlns:th="http://www.thymeleaf.org">
+
 <head>
-<meta charset="UTF-8">
-<title>ログイン</title>
+	<meta charset="UTF-8">
+	<title>ログイン</title>
 </head>
+
 <body>
-	
+
 	<h1>ログイン</h1>
-	<form action="doLogin"
-	      method="post"
-	      th:object="${loginInfoForm}">
 
-	    <div class="msgBox error" th:if="${messageError} != null">
-	        <span class="error" th:text="${messageError.message}"></span>
-	    </div>
+	<p class="message message-error" th:if="${loginError}" th:text="${loginError}">
+	</p>
 
-	    <table>
-	            <tr>
-	            <td class="btnArea" colspan="2">
-	                <input type="submit" value="ログイン"/>
-	                <button onclick="clearInput()">リセット</button>
-	            </td>
-	        </tr>
-	    </table>
+	<form th:action="@{/login}" th:object="${loginForm}" method="post">
+		<div class="form-group">
+			<label for="employeeId">社員ID</label>
+			<input id="employeeId" type="text" th:field="*{employeeId}">
+			<p class="field-error" th:errors="*{employeeId}"></p>
+		</div>
+
+		<div class="form-group">
+			<label for="passwordHash">パスワード</label>
+			<input id="passwordHash" type="password" th:field="*{passwordHash}">
+			<p class="field-error" th:errors="*{passwordHash}"></p>
+		</div>
+
+		<input type="submit" value="ログイン">
+		<input type="reset" value="リセット">
 	</form>
 
 </body>
+
 </html>
\ No newline at end of file
diff --git a/src/main/resources/templates/update.html b/src/main/resources/templates/update.html
index 1883fdf..eed51f5 100644
--- a/src/main/resources/templates/update.html
+++ b/src/main/resources/templates/update.html
@@ -5,6 +5,13 @@
 <title>図書情報更新入力</title>
 </head>
 <body>
-
+	更新入力画面
+	
+	<form method="post" action="updateconfirm">
+		<button type="submit" class="btn-login">
+			 <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M15 3h4a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2h-4"/><polyline points="10 17 15 12 10 7"/><line x1="15" y1="12" x2="3" y2="12"/></svg>
+				  更新内容確認
+		 </button>
+	</form>
 </body>
 </html>
\ No newline at end of file
diff --git a/src/main/resources/templates/updateConfirm.html b/src/main/resources/templates/updateConfirm.html
new file mode 100644
index 0000000..87eadc6
--- /dev/null
+++ b/src/main/resources/templates/updateConfirm.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="UTF-8">
+<title>更新内容確認</title>
+</head>
+<body>
+更新内容確認画面
+
+      <form method="post" action="update">
+		   <button type="submit" class="btn-login">
+               <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M15 3h4a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2h-4"/><polyline points="10 17 15 12 10 7"/><line x1="15" y1="12" x2="3" y2="12"/></svg>
+				    戻る
+		   </button>
+	  </form>
+	  
+	  <form method="post" action="bookUpdate">
+	  	   <button type="submit" class="btn-login">
+	                <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M15 3h4a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2h-4"/><polyline points="10 17 15 12 10 7"/><line x1="15" y1="12" x2="3" y2="12"/></svg>
+	  			    更新完了
+	  	   </button>
+	    </form>
+</body>
+</html>
\ No newline at end of file