Disclosed is a pair of bone calipers (1) used in an implant treatment in order to measure the width (bone width) between a guide hole or an implant hole and the alveolar bone surface. The pair of bone calipers (1) resembling scissors in shape comprises a probe arm (2) having a rodlike measuring portion (22) formed at the front end thereof, and a bent arm (3) having a bent measuring portion (32) formed at the front end thereof, wherein the distal end (33) of the measuring portion (32) is formed into the shape of a needle, and faces the distal end (23) of the measuring portion (22). When a bone width is measured, the rodlike measuring portion (22) of the probe arm (2) is inserted into a guide hole or an implant hole, and the distal end (33) of the bent measuring portion (32) of the bent arm (3) is brought into pressure contact with the gum until the alveolar bone surface is reached. In this state, a numerical value on a scale plate (6) indicated by a pointer (7) is read.