Kokoro Biidama

{{More references|date=February 2024}}{{Infobox song

| name = Kokoro Biidama

| cover = kokorobiidama.jpg

| alt =

| type = single

| artist = Rythem

| album = Mugen Factory

| B-side = M, Negai (Asayake ver.)

| released = March 1, 2006

| format =

| recorded =

| studio =

| venue =

| genre = Pop

| length =

| label = Sony Music Japan

| writer = Yui Nītsu and Yukari Katō

| producer =

| prev_title = '20 Tsubu no Kokoro'

| prev_year = 2006

| next_title = 'Negai'

| next_year = 2006

}}

{{nihongo|"Kokoro Biidama"|ココロビーダマ}} is the J-pop duo Rythem's ninth single.{{Cite web |title=rythem_special |url=https://www.sonymusic.co.jp/Music/Info/RYTHEM/special/plant.html |access-date=2024-02-08 |website=www.sonymusic.co.jp}} It was released on March 1, 2006 under Sony Music Entertainment Japan label.{{Cite web |title=ココロビーダマ {{!}} RYTHEM |url=https://www.oricon.co.jp/prof/319325/products/638683/1/ |access-date=2024-02-08 |website=ORICON NEWS}} The title track was used as the sixth ending theme for the anime Yakitate!! Japan making this their second and last tie-in with the said anime series. This single peaked the #53 spot in the Oricon weekly charts.

The item's stock number is AICL-1732.