A bone caliper 1 of the present invention is used in implant treatment, and measures the width (bone width) between the bone surface of the alveolar bone and a guide hole or an implant hole. The bone caliper 1 of the present invention has a shape resembling a pair of scissors, and is constituted by a probe arm 2 having a rod-shaped measurement portion 22 formed at its front end and a bent arm 3 having a curved-shaped measurement portion 32 formed at its front end. A tip 33 of the measurement portion 32 is machined into a needle shape and opposes a tip 23 of the measurement portion 22. For measurement of the bone width, the rod-shaped measurement portion 22 of the probe arm 2 is inserted into a guide hole or an implant hole, and the tip 33 of the curved measurement portion 32 of the bent arm 3 is pressed against the gingiva until the tip 33 reaches the bone surface of the alveolar bone. In this state, the numerical value on a scale plate 6 pointed by a pointer 7 is read.
