PROBLEM TO BE SOLVED: To easily configure a device for bone temperature measurement for measuring a temperature of a bone when the bone is processed by a cutting tool.SOLUTION: A temperature of a drill 3 which is inserted to a jawbone B and drills a dental implant embedding hole is measured at temperature measuring parts P1 and P2 which are exposed from the jawbone B and a mucous membrane M and are at different distances from the jawbone B to be processed by the drill 3. On the basis of the temperatures measured in the respective temperature measuring parts P1 and P2, the temperature of the jawbone B in contact with the distal end of the drill 3 is estimated.