To provide a round edge grinder capable of sharpening a round edge very easily.

A round edge 11 as a grinding object is placed on an endless abrasive paper spread between a round edge rest 1 capable of being held by one hand, and a grinder cover 3 capped to the round edge rest 1 and turned right and left by the other hand, and the round edge 11 is turned together with the grinder cover 3, thereby grinding the round edge 11. In other words, the round edge rest 1 is held by the left hand, and the grinder cover 3 is pressed by the right hand and turned right and left in an opposite direction as shown by an arrow. As a result, the grinder cover 3 having a center hole 4 with an insertion rod 5 passed, smoothly operates around the insertion rod 5. In addition, as the projections 16 and 17 of the grinder cover 3 are coupled to the eccentric holes 13 and 14 of the round edge 11, the round edge 11 as well repeats a turning motion right and left, together with the grinder cover 3.