diff --git a/app/src/main/java/jp/atled/agileworks/view/ui/documentweb/DocumentWebClient.kt b/app/src/main/java/jp/atled/agileworks/view/ui/documentweb/DocumentWebClient.kt
index 3e3ad9d23140922d07beeff5bbaa25f442721674..f8cac2e1864ccb8186c303d5246e31053b74db66 100644
--- a/app/src/main/java/jp/atled/agileworks/view/ui/documentweb/DocumentWebClient.kt
+++ b/app/src/main/java/jp/atled/agileworks/view/ui/documentweb/DocumentWebClient.kt
@@ -18,7 +18,7 @@ class DocumentWebViewClient(private val webShare: DocumentWebShare): WebViewClie
         super.onPageStarted(view, url, favicon)
         webShare.presenter.showLoadingProgressBar()
         url?.let {
-            webShare.presenter.updateTitle(it)
+            webShare.presenter.saveLastUrl(it)
         }
         webShare.presenter.updateAutoReloadState(true)  // 更新途中に読み込み失敗した場合、ネットワーク復帰時に自動リロードする
     }
diff --git a/app/src/main/java/jp/atled/agileworks/view/ui/documentweb/DocumentWebFragment.kt b/app/src/main/java/jp/atled/agileworks/view/ui/documentweb/DocumentWebFragment.kt
index ac69bed7d7d343d77a212910eadb7547acfd6e02..6fe824773832bc605aeacc6b69ac21f5d532f655 100644
--- a/app/src/main/java/jp/atled/agileworks/view/ui/documentweb/DocumentWebFragment.kt
+++ b/app/src/main/java/jp/atled/agileworks/view/ui/documentweb/DocumentWebFragment.kt
@@ -216,7 +216,7 @@ class DocumentWebFragment : Fragment(), DocumentWebPresenter {
                 setAcceptThirdPartyCookies(it, true)
             }
             lasturl?.let {
-                updateTitle(lasturl)
+                saveLastUrl(lasturl)
             }
             applyCookieManager(url, urlLoading)
         }
@@ -371,23 +371,22 @@ class DocumentWebFragment : Fragment(), DocumentWebPresenter {
     }
 
     // ツールバー部分のタイトルを更新する関数
-    override fun updateTitle(url: String) {
+    override fun saveLastUrl(url: String) {
         try {
             if (!isAdded) {
                 return
             }
-            // Titleを設定する URL を定義
-            val urlToTitle: Map<String, String> = hashMapOf(
+            // 保存する LastURL を定義
+            val setLastUrl: Map<String, String> = hashMapOf(
                 "Mobile#home" to requireActivity().baseContext.getString(R.string.main_label_home),
                 "Mobile#work" to requireActivity().baseContext.getString(R.string.main_label_work),
                 "Mobile#formSelection" to requireActivity().baseContext.getString(R.string.main_label_create_document),
                 "Mobile#agileWorksSearch" to requireActivity().baseContext.getString(R.string.main_label_search)
             )
             requireActivity().runOnUiThread {
-                urlToTitle.forEach { (k, v) ->
+                setLastUrl.forEach { (k, v) ->
                     if (url.contains(k)) {
                         lastUrl = url
-                        setTitle(v)
                     }
                 }
             }
@@ -395,18 +394,7 @@ class DocumentWebFragment : Fragment(), DocumentWebPresenter {
             // WebView が表示しているページによっては普通に起こり得るため単に握り潰す。
         }
     }
-    private fun setTitle(title: String) {
-        val activity = requireActivity()
-        val titleView = activity.findViewById<TextView>(R.id.toolbar_title)
-        if (titleView == null) {
-            // メイン表示: ツールバーのタイトルとして設定
-            val toolbar = activity.findViewById<Toolbar>(R.id.toolbar)
-            toolbar?.title = title
-        } else {
-            // 通知からの表示: 得られた TextView に設定
-            titleView.text = title
-        }
-    }
+
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         super.onActivityResult(requestCode, resultCode, data)
         when (requestCode) {
diff --git a/app/src/main/java/jp/atled/agileworks/view/ui/documentweb/DocumentWebPresenter.kt b/app/src/main/java/jp/atled/agileworks/view/ui/documentweb/DocumentWebPresenter.kt
index daaf6faa95ad6bd82475c76b05f96e99217f7450..71468c2d4f8df2d3d973c5dfcc43329a7b1c8d39 100644
--- a/app/src/main/java/jp/atled/agileworks/view/ui/documentweb/DocumentWebPresenter.kt
+++ b/app/src/main/java/jp/atled/agileworks/view/ui/documentweb/DocumentWebPresenter.kt
@@ -25,7 +25,7 @@ interface DocumentWebPresenter {
     /**
      * 現在開かれているページのタイトルを必要に応じて更新する。
      */
-    fun updateTitle(url: String)
+    fun saveLastUrl(url: String)
 
     // ネットワーク接続/切断関連
     /**
diff --git a/app/src/main/res/navigation/nav_create_document.xml b/app/src/main/res/navigation/nav_create_document.xml
index 6a397e55401b05239b4378413bdd50647543e612..d6e6e28f3f26760fe9481e7db1afb8002b823a09 100644
--- a/app/src/main/res/navigation/nav_create_document.xml
+++ b/app/src/main/res/navigation/nav_create_document.xml
@@ -7,11 +7,7 @@
     <fragment
         android:id="@+id/createDocumentDocumentWebFragment"
         android:name="jp.atled.agileworks.view.ui.documentweb.DocumentWebFragment"
-        android:label="{create_document_webview_title}">
-        <argument
-            android:name="create_document_webview_title"
-            android:defaultValue=""
-            app:argType="string" />
+        android:label="@string/main_label_create_document">
         <argument
             android:name="url"
             android:defaultValue="Broker/Mobile#formSelection"
diff --git a/app/src/main/res/navigation/nav_home.xml b/app/src/main/res/navigation/nav_home.xml
index b723ad6746f55b6328a9d9e3b4d110529b73b668..632085b850bd4595d0836ff439571ddce96cbbef 100644
--- a/app/src/main/res/navigation/nav_home.xml
+++ b/app/src/main/res/navigation/nav_home.xml
@@ -7,11 +7,7 @@
     <fragment
         android:id="@+id/homeDocumentWebFragment"
         android:name="jp.atled.agileworks.view.ui.documentweb.DocumentWebFragment"
-        android:label="{home_webview_title}">
-        <argument
-            android:name="home_webview_title"
-            android:defaultValue=""
-            app:argType="string" />
+        android:label="@string/main_label_home">
         <argument
             android:name="url"
             android:defaultValue="Broker/Mobile#home"
diff --git a/app/src/main/res/navigation/nav_search.xml b/app/src/main/res/navigation/nav_search.xml
index 13d457edcac0072102edb8c7004e9cd58b714a53..b6490f8b774a1b5be2d83e7276fe45db051a4db7 100644
--- a/app/src/main/res/navigation/nav_search.xml
+++ b/app/src/main/res/navigation/nav_search.xml
@@ -7,11 +7,7 @@
     <fragment
         android:id="@+id/searchDocumentDocumentWebFragment"
         android:name="jp.atled.agileworks.view.ui.documentweb.DocumentWebFragment"
-        android:label="{search_webview_title}">
-        <argument
-            android:name="search_webview_title"
-            android:defaultValue=""
-            app:argType="string" />
+        android:label="@string/main_label_search">
         <argument
             android:name="url"
             android:defaultValue="Broker/Mobile#agileWorksSearch"
diff --git a/app/src/main/res/navigation/nav_work.xml b/app/src/main/res/navigation/nav_work.xml
index fce598b9c5715f2eb8c2ffeb0d39f99e245b0609..4a3d37f0d75b21e2015d5bb4cb89d5cf460fa010 100644
--- a/app/src/main/res/navigation/nav_work.xml
+++ b/app/src/main/res/navigation/nav_work.xml
@@ -7,11 +7,7 @@
     <fragment
         android:id="@+id/workDocumentWebFragment"
         android:name="jp.atled.agileworks.view.ui.documentweb.DocumentWebFragment"
-        android:label="{work_webview_title}">
-        <argument
-            android:name="work_webview_title"
-            android:defaultValue=""
-            app:argType="string" />
+        android:label="@string/main_label_work">
         <argument
             android:name="url"
             android:defaultValue="Broker/Mobile#work"