(EN) The purpose of the present invention is to provide a shot blasting device that makes it possible to efficiently carry out dust collection and ventilation within a projection chamber while using a dust collector provided with a compact and inexpensive suction device. A shot blasting device according to the present invention is provided with: a cabinet (10); a plurality of treatment chambers (13a 13b) that are provided within the cabinet that are capable of accommodating a workpiece therein and that can be selectively moved between a carry in/carry out position and a projection position; an air supply port (19) for guiding outside air to the treatment chambers; and an exhaust port that is provided to a position facing the air supply port so as to sandwich a treatment chamber arranged in the projection position and that communicates linearly with the space within a treatment chamber arranged in the projection position. As a result of suction from the exhaust port air flowing into a treatment chamber in the projection position from the air supply port passes through the treatment chamber arranged in the projection position and is guided to the exhaust port.
