To provide a cloth piece folding device capable of folding a cloth piece accurately through adjustment of a driving speed of a bending plate. A cloth piece folding device includes a conveyor (12) to transfer a cloth piece (Y), a bending unit (32) to fold the cloth piece (Y), and a controller (50) to control operation of the bending unit (32). The bending unit (32) includes a bending plate (32a) and an actuator (32d) to make the bending plate (32a) move forward and backward. The actuator (32d) is capable of controlling an operating speed. The controller (50) adjusts a driving speed of the bending plate (32a) by controlling an operating speed of the actuator (32d) depending on a transfer speed of the conveyor (12). The driving speed of the bending plate (32a) is adjusted by the controller (50). This synchronizes the transfer speed of the conveyor (12) and the driving speed of the bending plate (32a) with each other. As a result, the cloth piece (Y) can be folded at a suitable bending position, so that the cloth piece (Y) can be folded accurately.