diff --git a/packages/frontend/src/components/MkPostForm.vue b/packages/frontend/src/components/MkPostForm.vue
index 0445536ae5..13b615d104 100644
--- a/packages/frontend/src/components/MkPostForm.vue
+++ b/packages/frontend/src/components/MkPostForm.vue
@@ -67,7 +67,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 	<MkInfo v-if="hasNotSpecifiedMentions" warn :class="$style.hasNotSpecifiedMentions">{{ i18n.ts.notSpecifiedMentionWarning }} - <button class="_textButton" @click="addMissingMention()">{{ i18n.ts.add }}</button></MkInfo>
 	<input v-show="useCw" ref="cwInputEl" v-model="cw" :class="$style.cw" :placeholder="i18n.ts.annotation" @keydown="onKeydown">
 	<div :class="[$style.textOuter, { [$style.withCw]: useCw }]">
-		<textarea ref="textareaEl" v-model="text" :class="[$style.text]" :disabled="posting || posted" :placeholder="placeholder" data-cy-post-form-text @keydown="onKeydown" @paste="onPaste" @compositionupdate="onCompositionUpdate" @compositionend="onCompositionEnd"/>
+		<textarea ref="textareaEl" v-model="text" :class="[$style.text]" :disabled="posting || posted" :readonly="textAreaReadOnly" :placeholder="placeholder" data-cy-post-form-text @keydown="onKeydown" @paste="onPaste" @compositionupdate="onCompositionUpdate" @compositionend="onCompositionEnd"/>
 		<div v-if="maxTextLength - textLength < 100" :class="['_acrylic', $style.textCount, { [$style.textOver]: textLength > maxTextLength }]">{{ maxTextLength - textLength }}</div>
 	</div>
 	<input v-show="withHashtags" ref="hashtagsInputEl" v-model="hashtags" :class="$style.hashtags" :placeholder="i18n.ts.hashtags" list="hashtags">
@@ -98,7 +98,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { inject, watch, nextTick, onMounted, defineAsyncComponent, provide } from 'vue';
+import { inject, watch, nextTick, onMounted, defineAsyncComponent, provide, ref } from 'vue';
 import * as mfm from 'mfm-js';
 import * as Misskey from 'misskey-js';
 import insertTextAtCursor from 'insert-text-at-cursor';
@@ -195,6 +195,7 @@ let hasNotSpecifiedMentions = $ref(false);
 let recentHashtags = $ref(JSON.parse(miLocalStorage.getItem('hashtags') ?? '[]'));
 let imeText = $ref('');
 let showingOptions = $ref(false);
+const textAreaReadOnly = ref(false);
 
 const draftKey = $computed((): string => {
 	let key = props.channel ? `channel:${props.channel.id}` : '';
@@ -846,12 +847,15 @@ function insertMention() {
 }
 
 async function insertEmoji(ev: MouseEvent) {
+	textAreaReadOnly.value = true;
+
 	emojiPicker.show(
 		ev.currentTarget ?? ev.target,
 		emoji => {
 			insertTextAtCursor(textareaEl, emoji);
 		},
 		() => {
+			textAreaReadOnly.value = false;
 			focus();
 		},
 	);