diff --git a/packages/frontend/src/pages/room.vue b/packages/frontend/src/pages/room.vue
index 242a15ec4c..7482f4310c 100644
--- a/packages/frontend/src/pages/room.vue
+++ b/packages/frontend/src/pages/room.vue
@@ -5,12 +5,15 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <template>
 <div :class="$style.root" class="_pageScrollable">
-	<canvas ref="canvas" :class="$style.canvas"></canvas>
+	<canvas ref="canvas" :class="$style.canvas" @keypress="onKeypress" @wheel="onWheel"></canvas>
 	<div v-if="engine != null" class="_buttons" :class="$style.controls">
-		<MkButton @click="toggleLight">Toggle Light</MkButton>
+		<!--<MkButton v-for="action in actions" :key="action.key" @click="action.fn">{{ action.label }}{{ hotkeyToLabel(action.hotkey) }}</MkButton>-->
 		<MkButton :primary="engine.isEditMode.value" @click="toggleEditMode">Edit mode: {{ engine.isEditMode.value ? 'on' : 'off' }}</MkButton>
 		<template v-if="engine.isEditMode.value">
-			<MkButton @click="grab">Grab (E)</MkButton>
+			<MkButton v-if="engine.ui.isGrabbing" @click="endGrabbing">Put (E)</MkButton>
+			<MkButton v-else-if="engine.ui.isGrabbingForInstall" @click="endGrabbing">Install (E)</MkButton>
+			<MkButton v-else @click="beginSelectedInstalledObjectGrabbing">Grab (E)</MkButton>
+
 			<MkButton :primary="engine.enableGridSnapping.value" @click="toggleGridSnapping">Grid Snap: {{ engine.enableGridSnapping.value ? 'on' : 'off' }}</MkButton>
 			<MkButton v-if="engine.enableGridSnapping.value" :primary="engine.gridSnappingScale.value === 1" @click="engine.gridSnappingScale.value = 1">Snap: 1cm</MkButton>
 			<MkButton v-if="engine.enableGridSnapping.value" :primary="engine.gridSnappingScale.value === 2" @click="engine.gridSnappingScale.value = 2">Snap: 2cm</MkButton>
@@ -27,7 +30,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { defineAsyncComponent, onMounted, onUnmounted, ref, shallowRef, useTemplateRef, watch } from 'vue';
+import { computed, defineAsyncComponent, onMounted, onUnmounted, ref, shallowRef, useTemplateRef, watch } from 'vue';
 import { definePage } from '@/page.js';
 import { i18n } from '@/i18n.js';
 import { ensureSignin } from '@/i';
@@ -50,6 +53,95 @@ function resize() {
 	if (engine.value != null) engine.value.resize();
 }
 
+type Action = {
+	key: string;
+	label: string;
+	fn: () => void;
+	hotkey?: string;
+};
+
+function hotkeyToLabel(hotkey: string) {
+	if (hotkey.startsWith('Key')) {
+		return hotkey.slice(3);
+	} else if (hotkey.startsWith('Digit')) {
+		return hotkey.slice(5);
+	} else {
+		return hotkey;
+	}
+}
+
+const actions = computed<Action[]>(() => {
+	if (engine.value == null) return [];
+
+	const actions: Action[] = [];
+
+	if (engine.value.isEditMode.value) {
+		actions.push({
+			key: 'grab',
+			label: 'Grab',
+			fn: () => {
+				engine.value!.beginSelectedInstalledObjectGrabbing();
+				canvas.value!.focus();
+			},
+			hotkey: 'KeyE',
+		});
+	}
+
+	if (engine.value.isSitting.value) {
+		actions.push({
+			key: 'standUp',
+			label: 'Stand Up',
+			fn: () => engine.value!.standUp(),
+			hotkey: 'KeyQ',
+		});
+	}
+
+	return actions;
+});
+
+function onKeypress(ev: KeyboardEvent) {
+	if (engine.value == null) return;
+
+	/* todo
+	if (ev.code === 'KeyE') {
+		ev.preventDefault();
+		ev.stopPropagation();
+		if (engine.value.isEditMode.value) {
+			if (engine.value.ui.isGrabbing || engine.value.ui.isGrabbingForInstall) {
+				this.endGrabbing();
+			} else {
+				this.beginSelectedInstalledObjectGrabbing();
+			}
+		} else if (this.selectedObjectId.value != null) {
+			this.interact(this.selectedObjectId.value);
+		}
+	} else if (ev.code === 'KeyR') {
+		ev.preventDefault();
+		ev.stopPropagation();
+		if (this.grabbingCtx != null) {
+			this.grabbingCtx.rotation += Math.PI / 8;
+		}
+	} else if (ev.code === 'KeyQ') {
+		ev.preventDefault();
+		ev.stopPropagation();
+		if (this.isSitting.value) {
+			this.standUp();
+		}
+	}
+		*/
+}
+
+function onWheel(ev: WheelEvent) {
+	if (engine.value == null) return;
+
+	if (engine.value.ui.isGrabbing || engine.value.ui.isGrabbingForInstall) {
+		ev.preventDefault();
+		ev.stopPropagation();
+
+		engine.value.changeGrabbingDistance(ev.deltaY * 0.025);
+	}
+}
+
 onMounted(() => {
 	engine.value = new RoomEngine({
 		roomType: 'default',
@@ -316,14 +408,16 @@ onUnmounted(() => {
 	window.removeEventListener('resize', resize);
 });
 
-// todo: 掴む/離す(or 設置)のボタン出し分け
-// grabbing中かどうか、家具設置中かどうかをengineからリアクティブにもらう必要あり？
-
-function grab() {
+function beginSelectedInstalledObjectGrabbing() {
 	engine.value.beginSelectedInstalledObjectGrabbing();
 	canvas.value!.focus();
 }
 
+function endGrabbing() {
+	engine.value.endGrabbing();
+	canvas.value!.focus();
+}
+
 function toggleLight() {
 	engine.value.toggleRoomLight();
 	canvas.value!.focus();
diff --git a/packages/frontend/src/utility/room/engine.ts b/packages/frontend/src/utility/room/engine.ts
index 77852303ac..42ec757679 100644
--- a/packages/frontend/src/utility/room/engine.ts
+++ b/packages/frontend/src/utility/room/engine.ts
@@ -25,7 +25,7 @@ import { registerBuiltInLoaders } from '@babylonjs/loaders/dynamic';
 import { BoundingBoxRenderer } from '@babylonjs/core/Rendering/boundingBoxRenderer';
 import { GridMaterial } from '@babylonjs/materials';
 import { ShowInspector } from '@babylonjs/inspector';
-import { ref, watch } from 'vue';
+import { reactive, ref, watch } from 'vue';
 import { genId } from '../id.js';
 import { getObjectDef } from './object-defs.js';
 import { HorizontalCameraKeyboardMoveInput } from './utility.js';
@@ -167,6 +167,10 @@ export class RoomEngine {
 	private zGridPreviewPlane: BABYLON.Mesh;
 	public isEditMode = ref(false);
 	public isSitting = ref(false);
+	public ui = reactive({
+		isGrabbing: false,
+		isGrabbingForInstall: false,
+	});
 
 	constructor(roomState: RoomState, options: {
 		canvas: HTMLCanvasElement;
@@ -414,43 +418,6 @@ export class RoomEngine {
 			}
 		});
 
-		this.canvas.addEventListener('keypress', (ev) => {
-			if (ev.code === 'KeyE') {
-				ev.preventDefault();
-				ev.stopPropagation();
-				if (this.isEditMode.value) {
-					if (this.grabbingCtx != null) {
-						this.endGrabbing();
-					} else {
-						this.beginSelectedInstalledObjectGrabbing();
-					}
-				} else if (this.selectedObjectId.value != null) {
-					this.interact(this.selectedObjectId.value);
-				}
-			} else if (ev.code === 'KeyR') {
-				ev.preventDefault();
-				ev.stopPropagation();
-				if (this.grabbingCtx != null) {
-					this.grabbingCtx.rotation += Math.PI / 8;
-				}
-			} else if (ev.code === 'KeyQ') {
-				ev.preventDefault();
-				ev.stopPropagation();
-				if (this.isSitting.value) {
-					this.standUp();
-				}
-			}
-		});
-
-		this.canvas.addEventListener('wheel', (ev) => {
-			if (this.grabbingCtx != null) {
-				ev.preventDefault();
-				ev.stopPropagation();
-				this.grabbingCtx.distance -= ev.deltaY * 0.025;
-				if (this.grabbingCtx.distance < 5/*cm*/) this.grabbingCtx.distance = 5/*cm*/;
-			}
-		});
-
 		if (_DEV_) {
 			const axes = new AxesViewer(this.scene, 30);
 			axes.xAxis.position = new BABYLON.Vector3(0, 30, 0);
@@ -953,6 +920,8 @@ export class RoomEngine {
 
 		let sticky: string | null;
 
+		this.ui.isGrabbing = true;
+
 		this.grabbingCtx = {
 			objectId: selectedObject.metadata.objectId,
 			objectType: selectedObject.metadata.objectType,
@@ -968,9 +937,13 @@ export class RoomEngine {
 				sticky = info.sticky;
 			},
 			onCancel: () => {
+				this.ui.isGrabbing = false;
+
 				// todo: initialPositionなどを復元
 			},
 			onDone: () => { // todo: sticky状態などを引数でもらうようにしたい
+				this.ui.isGrabbing = false;
+
 				// 親から先に外していく
 				const removeStickyParentRecursively = (mesh: BABYLON.Mesh) => {
 					const stickyObjectIds = Array.from(this.roomState.installedObjects.filter(o => o.sticky === mesh.metadata.objectId)).map(o => o.id);
@@ -1011,7 +984,7 @@ export class RoomEngine {
 		});
 	}
 
-	private endGrabbing() {
+	public endGrabbing() {
 		if (this.grabbingCtx == null) return;
 
 		//this.grabbing.ghost.dispose(false, true);
@@ -1113,6 +1086,8 @@ export class RoomEngine {
 
 		let sticky: string | null;
 
+		this.ui.isGrabbingForInstall = true;
+
 		this.grabbingCtx = {
 			objectId: id,
 			objectType: type,
@@ -1128,9 +1103,13 @@ export class RoomEngine {
 				sticky = info.sticky;
 			},
 			onCancel: () => {
+				this.ui.isGrabbingForInstall = false;
+
 				// todo
 			},
 			onDone: () => { // todo: sticky状態などを引数でもらうようにしたい
+				this.ui.isGrabbingForInstall = false;
+
 				const pos = this.grabbingCtx.mesh.position.clone();
 				const rotation = this.grabbingCtx.mesh.rotation.clone();
 
@@ -1165,6 +1144,12 @@ export class RoomEngine {
 		});
 	}
 
+	public changeGrabbingDistance(delta: number) {
+		if (this.grabbingCtx == null) return;
+		this.grabbingCtx.distance -= delta;
+		if (this.grabbingCtx.distance < 5/*cm*/) this.grabbingCtx.distance = 5/*cm*/;
+	}
+
 	public resize() {
 		this.engine.resize();
 	}