diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 5ab57da71e..bae7a1173d 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -884,6 +884,8 @@ desktop/views/components/settings.vue:
   auto-popout-desc: "ウィンドウが開かれるとき、ポップアウト(ブラウザ外に切り離す)可能なら自動でポップアウトします。この設定はブラウザに記憶されます。"
   deck-nav: "デッキ内ナビゲーション"
   deck-nav-desc: "デッキを使用しているとき、ナビゲーションが発生する際にページ遷移を行わずに一時的なカラムで受けるようにします。"
+  keep-cw: "CW保持"
+  keep-cw-desc: "投稿にリプライする際、リプライ元の投稿にCWが設定されていたとき、デフォルトで同じCWを設定するようにします。"
   deck-default: "デッキをデフォルトのUIにする"
 
   display: "デザインと表示"
@@ -1664,6 +1666,7 @@ mobile/views/pages/settings.vue:
   notification-position-top: "上"
   behavior: "動作"
   fetch-on-scroll: "スクロールで自動読み込み"
+  keep-cw: "CW保持"
   note-visibility: "投稿の公開範囲"
   default-note-visibility: "デフォルトの公開範囲"
   remember-note-visibility: "投稿の公開範囲を記憶する"
diff --git a/src/client/app/desktop/views/components/post-form.vue b/src/client/app/desktop/views/components/post-form.vue
index 9c2807663b..5b2a305404 100644
--- a/src/client/app/desktop/views/components/post-form.vue
+++ b/src/client/app/desktop/views/components/post-form.vue
@@ -222,6 +222,12 @@ export default Vue.extend({
 			});
 		}
 
+		// keep cw when reply
+		if (this.$store.state.settings.keepCw && this.reply && this.reply.cw) {
+			this.useCw = true;
+			this.cw = this.reply.cw;
+		}
+
 		this.$nextTick(() => {
 			// 書きかけの投稿を復元
 			if (!this.instant && !this.mention) {
diff --git a/src/client/app/desktop/views/components/settings.vue b/src/client/app/desktop/views/components/settings.vue
index bd17018a6f..95c107a0d5 100644
--- a/src/client/app/desktop/views/components/settings.vue
+++ b/src/client/app/desktop/views/components/settings.vue
@@ -31,7 +31,12 @@
 				<ui-switch v-model="autoPopout">{{ $t('auto-popout') }}
 					<span slot="desc">{{ $t('auto-popout-desc') }}</span>
 				</ui-switch>
-				<ui-switch v-model="deckNav">{{ $t('deck-nav') }}<span slot="desc">{{ $t('deck-nav-desc') }}</span></ui-switch>
+				<ui-switch v-model="deckNav">{{ $t('deck-nav') }}
+					<span slot="desc">{{ $t('deck-nav-desc') }}</span>
+				</ui-switch>
+				<ui-switch v-model="keepCw">{{ $t('keep-cw') }}
+					<span slot="desc">{{ $t('keep-cw-desc') }}</span>
+				</ui-switch>
 			</section>
 
 			<section>
@@ -336,6 +341,11 @@ export default Vue.extend({
 			set(value) { this.$store.commit('settings/set', { key: 'deckNav', value }); }
 		},
 
+		keepCw: {
+			get() { return this.$store.state.settings.keepCw; },
+			set(value) { this.$store.commit('settings/set', { key: 'keepCw', value }); }
+		},
+
 		darkmode: {
 			get() { return this.$store.state.device.darkmode; },
 			set(value) { this.$store.commit('device/set', { key: 'darkmode', value }); }
diff --git a/src/client/app/mobile/views/components/post-form.vue b/src/client/app/mobile/views/components/post-form.vue
index 24263d18fe..b6e70a5b11 100644
--- a/src/client/app/mobile/views/components/post-form.vue
+++ b/src/client/app/mobile/views/components/post-form.vue
@@ -210,6 +210,12 @@ export default Vue.extend({
 			});
 		}
 
+		// keep cw when reply
+		if (this.$store.state.settings.keepCw && this.reply && this.reply.cw) {
+			this.useCw = true;
+			this.cw = this.reply.cw;
+		}
+
 		this.focus();
 
 		this.$nextTick(() => {
diff --git a/src/client/app/mobile/views/pages/settings.vue b/src/client/app/mobile/views/pages/settings.vue
index 80b15acdea..cc7eb1e300 100644
--- a/src/client/app/mobile/views/pages/settings.vue
+++ b/src/client/app/mobile/views/pages/settings.vue
@@ -66,6 +66,7 @@
 
 				<section>
 					<ui-switch v-model="fetchOnScroll">{{ $t('fetch-on-scroll') }}</ui-switch>
+					<ui-switch v-model="keepCw">{{ $t('keep-cw') }}</ui-switch>
 					<ui-switch v-model="disableViaMobile">{{ $t('disable-via-mobile') }}</ui-switch>
 					<ui-switch v-model="loadRawImages">{{ $t('load-raw-images') }}</ui-switch>
 					<ui-switch v-model="loadRemoteMedia">{{ $t('load-remote-media') }}</ui-switch>
@@ -247,6 +248,11 @@ export default Vue.extend({
 			set(value) { this.$store.dispatch('settings/set', { key: 'fetchOnScroll', value }); }
 		},
 
+		keepCw: {
+			get() { return this.$store.state.settings.keepCw; },
+			set(value) { this.$store.dispatch('settings/set', { key: 'keepCw', value }); }
+		},
+
 		rememberNoteVisibility: {
 			get() { return this.$store.state.settings.rememberNoteVisibility; },
 			set(value) { this.$store.dispatch('settings/set', { key: 'rememberNoteVisibility', value }); }
diff --git a/src/client/app/store.ts b/src/client/app/store.ts
index 350826e5ef..46655b7bd5 100644
--- a/src/client/app/store.ts
+++ b/src/client/app/store.ts
@@ -12,6 +12,7 @@ const defaultSettings = {
 	mobileHome: [],
 	deck: null,
 	deckNav: true,
+	keepCw: false,
 	tagTimelines: [],
 	fetchOnScroll: true,
 	showMaps: true,