PURPOSE: To fix connecting fittings, to which each electrode at both ends of an exciting lamp is inserted and contacted, to a contacting base, to which electricity must be applied, properly and positively without an individual difference, and to bring the electrodes of the exciting lamp and the connecting fittings into contact electrically and completely when the connecting fittings are positioned and fixed to the contacting base.

CONSTITUTION: The electrode 1A of an exciting lamp 1 is inserted into the center hole of the splitted cylindrical section of a bearer 2, and clamped and held from all directions by clamping a nut 3, and the bearer 2 is tightened to a substrate 5 by a screw through a metal leaf 4. A fixture 8 is mounted on the cover 11 side of a case, in which a laser oscillation principal section is housed, in a shape that the fixture receives energizing in the downward direction by a spring 9. Accordingly, the substrate 5 is pushed and fixed against a contacting base 6 by the fixture 8 receiving the energizing of the spring at the same time as the cover 11 is set up to the case.