To provide a stone mill which can be easily handled e.g. when transported and the weight of the upper mill of which is adjustable according to a material to be ground, e.g. buckwheat, sesame, soy beans, or tea leaves.

In a stone mill which has an upper mill (1) and a lower mill (3) and grinds a material (5) between the lower side (1a) of the upper mill and the upper side (3a) of the lower mill by rotating the upper mill placed on the lower mill, the upper mill is equipped with a weight (33) which is freely attachable or detachable.