a cabinet in which multiple chambers are formed;

a transporter that transports an object to be processed in a predetermined transport direction within at least the cabinet;

a shot-projecting machine that is placed in a chamber for projecting the shots, which is one of the multiple chambers, and that projects the shots onto the object to be processed that has been transported into the chamber for projecting the shots;

an air-blowing machine that is placed in a chamber for blowing air, which is one of the multiple chambers, that is downstream of the chamber for projecting the shots in the predetermined transport direction, which machine blows air onto the object to be processed that has been transported into the chamber for blowing air;

a circulating machine that circulates the shots that have a diameter that makes them reusable among the shots that have been projected by the shot-projecting machine and have dropped on a bottom of the chamber for projecting the shots;

a dust collector that is connected to the cabinet to suction air therein that contains dust;

a flow path structure including a first flow path and a second flow path, the first flow path configured to form a part of a flow path to connect the inside of the cabinet with a suction port of the dust collector and configured to be a part of a route for circulation of the circulating machine, and the second flow path configured to connect the chamber for blowing air with the suction port of the dust collector; and

a classifying part that is provided in the flow path structure, which includes a part of the first flow path and a part of the second flow path, and that classifies particulate objects that include the shots as shots that have a diameter that makes them reusable and as other particulate objects.