To provide a bulb fixing structure reducing the number of part items and simplifying assembling work.

A bulb socket 12 is abutted against a bulb mounting hole provided in a reflector 6 as a luminaire main body portion, and the bulb socket 12 is fixed into elastic contact with the reflector 6 by means of a set spring 11 by which the whole is bent and formed into a U shape and an engagement end portion 111 on both ends thereof is engaged into an engagement hole 21 provided on a fixing wall 18. A lock portion 113 to be locked with a locking hole 22 of the fixing wall 18 is provided at a portion between the engagement tip end of the set spring 11 and an intermediate portion 112, and the portion between this lock portion 112 and the engagement end portion 111 is constituted as an abutting portion 114 to be abutted with the bulb socket 12 and applying its elastic contact force. Thus, the abutting portion 114 is constituted short, its elastic force is enhanced, workability of the set spring 11 is improved, and fixing force is improved.