To enable the opening angle of a dental clamp to be fixed within a wide range and not to be displaced by strong clamping force, by equipping an opening adjusting means between both holding parts to fix the opening angle of a pair of clamping parts in a prescribed angle with respect to both opening and closing angles.

An opening adjusting means 20 is equipped between both holding parts. The opening adjusting means 20 composed of a guide member 21 comprising a bent bar shaped member and a screw type fixing member 24 to fix the guide member 21 to a holding member 11. One end of the guide member 21 is supported rotatable around a rotation axis 22 on the rear end of one holding part and the other end is inserted through a through hole 23 of the other holding part 11. The inserted part of the guide member 21 is slid and guided in to the through hole 23 and fixed by a fixing member 24 to set and fix the opening angle of the holding parts 11, 11, i.e., the opening angle of the clamping parts 13, to a desired one. Since the holding part 11 is fixed by the fixing member 24, the holding parts 11 is never dislocated even when strongly gripped.