| 摘要 |
PROBLEM TO BE SOLVED: To prevent variation in mounting strength with the elapse of time by providing a pair of hook plug blade receiving portions that are respectively electrically connected to quick connection terminals corresponding to a pair of substantially circular arc hook plug blade inlets opening through the lower face of an apparatus body, and a hook holding the hook plug blades when respective hook plug blades inserted from the hook plug blade inlets move for the other ends. SOLUTION: A locking pawl 9a of a slide member 9 that is provided on the inner wall facing an engaging hole 53 vertically penetrating through a mounting tool 52 provided in the central part of a luminaire 2 such that the pawl 9a can rise and set in the engaging hole 53 is locked on the upper surface of a collar shaped projection 10. By locking the locking pawl 9a with the collar shaped projection 10, a downward load of the luminaire 2 is received and the luminaire 2 is mechanically held for a hook ceiling 1. By receiving the load of the luminaire 2 also by the collar shaped projection 10 formed on an apparatus body 11, and providing a mechanical connecting portion also around the hook ceiling 1, fixing strength can be increased and deformation of a hook plug blade with the lapse of time can be prevented.
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