A toy gun includes a driven lever, a driven member, a pivot member, a push block, a drive mechanism, a triggering device, and a housing. Thus, the toy gun can shoot the plastic cartridges successively in an automatically controlled manner by the motor and the power switch and can also shoot the plastic cartridges individually in a manual manner by pulling the pull member and pressing the trigger, thereby enhancing the versatility of the toy gun, and thereby increasing the playing amusement of the toy gun.