An osseointegration method of integrating bone and implant material includes, for integrating the bone and the implant material shortly and easily, a drilling step of drilling a hole in a bone 51 or implant material 52 through to a junction of the bone 51 and the implant material 52 by applying a laser beam to the bone 51 or the implant material 52, and an integrating step of integrating the bone 51 and the implant material 52 by applying a laser beam to the junction of the bone 51 and the implant material 52 through the hole drilled at the drilling step.