A shotblasting apparatus, comprising a charging machine (7) charging workpieces into an upwardly opened rotary drum (5). The charging machine comprises a bucket loader (29) having a tip opening openable by a cover (35) and a swing frame (32) installed on a base (4) through a link (31) to vertically swing the loader (29). After the loader (29) reaches the upper position of the rotary drum (5), a guide mechanism (30) installed on the swing frame (32) advances the loader (29) into the drum (5) through the upper opening of the drum. After the tip of the loader is moved close to the inner peripheral wall or the bottom wall of the drum (5), the cover (35) is opened to roll down the workpieces in the loader (29) into the drum (5). Since the workpieces fall down from a position rather lower than the inner peripheral wall or the bottom wall of the drum, falling impact can be suppressed and, accordingly, damage to the workpieces and noise can be suppressed.