To provide a fitting structure of a lamp unit, the flexible arm of which can be made small and is so excellent that dropout of the lamp unit can be prevented.
The fitting structure of a room lamp 11 is constituted such that the room lamp 11 is fit to a roof trim 13 to form a roof module 19 and the roof module 19 is assembled so as to cover a reinforce 15. A fixing means for fixing the room lamp 11 to the reinforce 15 includes: the flexible arm 43 which is suspended over the room lamp 11 and the tip 49 of which is locked with one fitting part 51 of the reinforce 15; a leaf spring member 45, the tip 65 of which is locked with the other fitting part 71 thereof to press the room lamp 11 to the one fitting part 51; and an abutting part 47 which is arranged adjacently to the side face of the flexible arm 43 and abutted on the one fitting part 51 of the reinforce 15 to control a locking tolerance 91 of the tip 49 of the flexible arm 43.
Toshimitsu Ichikawa