To carryout the sure illumination of the vicinity of corners by providing an outside fluorescent lump while straddling the openings of neighboring two surfaces.

An outside fluorescent lamp 4, in which sockets 9 are provided at both ends thereof, is provided in front of an air outlet port 8 along the air outlet port 8. The outside fluorescent lamp 4 is constituted of L-shape fluorescent lamps 4A, provided so as to override the openings of neighboring two surfaces, and a straight tube type fluorescent lamp 4B, provided between L-shape fluorescent lamps 4A. On the other hand, an inside fluorescent lamp 5, in which sockets 9 are connected to both ends thereof, is provided at the rear part of the air outlet port 8 along the air outlet port 8. The inside fluorescent lamp 5 is constituted of L-shape fluorescent lamps 5A provided so as to straddle the openings of neighboring two surfaces, and a straight tube type fluorescent lamp 5B provided between the L-shape fluorescent lamps 5A. The vicinity of corners of a shade 3 are illuminated from the rear part thereof to appeal films bonded on the shade 3.