To dispense with a chip attaching and detaching tool for attaching and detaching a chip (blade object) to/from a hand piece and to spot-illuminate a chip distal end by directing the chip distal end to the same direction at all times at the time of attaching the chip to the hand piece.

A vibration body 2 is formed integrally with a vibrator and linearly, extended from a hand piece main body and freely detachably fixed at a prescribed angle θ to the vibration body at an extended part. For the vibration body 2, the chip 39 can be inserted at the prescribed angle θ from the above to a distal end part side, and the inserted chip 30 is fixed to the vibration body 2 by a chip fixing member 40.