The utility model provides a casting sand regenerating unit can be effectively detaches the adnexed adhesive of casting sand of finishing using retrieving etc.. The sand that the foundry goods of finishing using was used is supplied with spout (14A) from sand and is supplied with to rotator (16). Do all can and the rotation with the help of the drive of drive division (20) rotator (16) to the disrotatory is turned (16) inside sand and is exerted frictional force. Then, make sand in rotator (16) descend to wash bowl (30) of the downside of rotator (16) in. In wash bowl (30), do all can and the rotation with the help of the drive of drive division (20) mixer (34) to sand to in the wash bowl (30) is washed while stirring.