To avoid overgrinding with a simple structure and to enhance grinding effect.

In this grinding device 1, an inner cone 4 forming an annual grinding space 3 wider at the upper part and narrower at the lower part between the inner cone 4 and an outer cylinder 2 is arranged concentrically in the inside of the upright outer cylinder 2. The inner cone 2 is suspended via a spring 11 and is freely movable in the horizontal direction against the outer cylinder 2. On an upper end surface of the inner cone 4, a vibrator 12 is attached and the inner cone 4 is vibrated and a compression impulse force due to the vibration is worked on an article to be ground flowing down from the upper part of the grinding space 3 toward the lower part.