To provide a part end face grinding device which easily and precisely finishes a part end face by grinding it.

This part end face grinding device has a holder 19 to hold a ground part such as an illustrated hexagonal bolt 20, and the ground part is arranged in a posture to make a right angle with a grinding face of a grinding tool 6 (grinding wheel) of a grinder 3 by fitting this holder 19 in a mounting part 18 provided on a rotary member 15. A ground face of the ground part is ground by making contact with the grinding tool 6 by the rotating grinding tool 6 when rotating the grinding tool 6 by operation of the grinder 3 and revolving the rotary member 15 around a rotary shaft 13 as its center by gripping the holder 19 in this state.