When one motor rotates a rotating disk, the rotating disk rotates a first moving body, and the rotating disk moves a second moving body from an initial position against a bias force of a bias unit, a protrusion of the rotating disk engages with allowance with a recess portion of the first moving body so that the rotating disk does not rotate reversely when the second moving body returns to the initial position. With this device, it is possible to move only either one of two moving bodies operated by one motor.