The Birth Buster (バースバスター Bāsu Basutā) is Kamen Rider Birth's personal firearm weapon, created by Doctor Maki as part of the Kougami Foundation's Medal System. It first appears in Kamen Rider × Kamen Rider OOO & W Featuring Skull: Movie War Core, and then made its TV debut in episode 16. When Satonaka becomes Goto's assistant, she also wields a Birth Buster.