The present invention has the object of providing a shot processing machine capable of constraining the spilling over and dropping of projection material to outside the projection chamber. The shot processing machine of the invention is a shot processing machine for performing surface treatment by projecting projection material onto a workpiece inside a projection chamber, comprising: a cabinet inside of which a projection chamber is formed, an opening disposed on the cabinet for loading and discharging workpieces; and a door movably attached to the cabinet, for opening and closing the opening, whereby a projection material adhesion prevention mechanism for preventing the adhesion of projection material is provided on the inside of the door.