PURPOSE: To provide novel pressure control part for a low friction type cylinder which exerts a light pressure force on a work when the grinding wheel of grinding wheel unit effects grinding in conformity to the shape of a the work.

CONSTITUTION: A burr removing grinding device 100 comprises a grinding wheel unit 20 to perform chamfering of the outer or the inner peripheral edge of a work W grasped to a low speed rotating revolving table, a pressure control part 10 for a low friction type cylinder 14 to exert a light pressure force F3 on the work when the grinding wheel 1 of the grinding wheel unit performs grinding in conformity to the shape of the work, and a moving member 40 to move forward and backward the grinding wheel unit and the pressure control part 10.