PURPOSE: To remove the static electricity charged to the abrasive material and the like floating in a cabinet.

CONSTITUTION: While a blast gun 6 to inject an abrasive material 99 to a work 9; a bed to hold the work 9; a cabinet 5 to house the work 9 loaded on the bed 3 and the like at the inside; are provided, also an electricity removing device 1 which consists of an electricity removing bar 11 and the like is provided in the cabinet 5, at the place separated a specific distance H from the upper surface of the work 9. This electricity removing device 1 consists of the electrict removing bar 11 of a corona discharge type, and an earth feeder 12 to connect between the electricity removing bar 11 and an earth 19. By the function of ions generated by a corona discharge, the static electricity charged in the abrasive material 99 and the like floating in the space can be removed efficiently.