To provide a wet type blasting device which eliminates adverse effects due to scattering of a polishing agent and removes burrs and foreign matters in a wide range for a matter to be treated.

The wet type blasting device jets a polishing agent mixed liquid toward the matter to be treated in such a state that the matter is immersed in the polishing agent mixed liquid, and performs blasting. The wet type blasting device is equipped with: a blasting treatment bath 1 for storing the polishing agent mixed liquid and performing blasting; a liquid tank 2 for storing clean treatment liquid for separating the polishing agent from the mixed liquid; a jet nozzle 3 which is installed in the blasting treatment bath 1 and jets the polishing agent mixed liquid to the matter to be treated in the polishing agent mixed liquid; a separation device 7 for separating the clean treatment liquid from the polishing agent mixed liquid to feed into the liquid tank; a jet pump 5 for supplying the polishing mixed liquid high-pressure treatment liquid to the jet nozzle; and an agitation pump 6 which agitates the polishing agent mixed liquid in the blasting treatment bath, and supplies the polishing agent mixed liquid for the jet nozzle.