"Kokoro Biidama" (ココロビーダマ) is the J-pop duo Rythem's ninth single.

[1] It was released on March 1, 2006 under Sony Music Entertainment Japan label.

[2] 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.