INVERSELY MOUNTAIN SHAPED LUMINAIRE

PROBLEM TO BE SOLVED: To easily mount/demount an inversely mountain shaped reflecting plate on/from a socket mounting plate, improve workability, show a fixture head to be almost inconspicuous along the ridge line of the inversely mountain shaped reflecting plate in a normal condition, prevent ill effect in design and perform smooth work. SOLUTION: An inversely mountain shaped luminaire has a luminaire body 10 with socket mounting plates 11 fixed to both ends and an inversely mountain shaped reflecting plate 20 to cover the luminaire body 10 at the lower face side. A slender mounting recess 22 is provided near a ridge line 21 at the lowest position on the inversely mountain shaped reflecting plate 20 along the longitudinal direction of the ridge line 21. A mounting hole 23 is provided in the center of the mounting recess 22. A mounting receiving hole 12 is provided in the socket mounting plate 11. A rotational catch type fixture 90 is engaged with the mounting receiving hole 12 via the mounting hole 23 in a disengageable manner. The fixture 90 has a slender head 91 to be stored in the mounting recess 22. The engagement position is fixed, where the fixture 90 is engaged with the mounting receiving hole 12 when the slender fixture head 91 matches the slender mounting recess 22 in the longitudinal direction.