Abstract: A foldable guitar has a guitar body. The guitar body includes a main body and a rotating bar fixed to the main body. The rotating bar has a top end and a bottom end. Each of the top end and the bottom end is pivoted to the main body. A shape of the rotating bar matches a profile shape of the main body, and the rotating bar is foldable, such that a size of the guitar body is reduced when the rotating bar is folded toward the main body.