To easily perform the chamfering of a vegetable block piece by pinching the vegetable block piece between a rotary table and a clamp rotary shaft and providing a worm gear mechanism for moving a chamfer blade mecha nism to a clamp rotation mechanism.

A cam 18a is rotated by a worm 13a and a worm wheel 17a, a slide arm 15 is lowered according to the shape of the cam 18a, and the edge of a clamp rotary shaft 10 presses the top face of a vegetable and pinches the vegetable M between the edge and a rotary table 11 so as to rotate integrally. The cam 18b is rotated by the worm 13b and the worm wheel 17b, gradually pushes toward the vegetable M on the rotary table 11 with the cutting blade 21 of a chamfer blade mechanism inclined, and the cutting blade 21 is pushed against the top corner angle of the vegetable M so as to chamfer.