Laser apparatus and its manufacturing method, comprising frames joined together|with a bolt-based system

A laser apparatus may include, a first frame (81) and a second frame (82), a sleeve through-hole (88) provided in the second frame (82), a sleeve insertion hole (86) provided in the first frame (81), a screw (86), a positioning sleeve (82) that is formed in an approximately cylindrical shape into which the screw (86) can be inserted and that positions the first frame (81) and the second frame (82) by passing through the sleeve through-hole (88) and being inserted into the sleeve insertion hole (86), a nut (91) that is provided in the first frame (81) and into which the screw (86) is screwed, and a fall prevention unit (92) that is provided in the second frame (82) and that prevents the screw (86) and the positioning sleeve (82) from falling.