The prize arrangement is limited in many conventional prize-winning game machines, in which the usable area is only the floor. In a crane game machine of the present invention for grasping a prize, an object grasping system (grasping arms) grasping a prize is suspended by a first and a second wire which are respectively controlled in length by a first and a second Z mechanisms. Thus, the object grasping system can be moved in the longitudinal and the vertical direction, and a direction of the grasping arms can be rotated up-and-down by a predetermined angle. As a result, the grasping arms are capable of grasping the prize disposed on a self provided on the back wall face side of the game machine.