To prevent breakage of an outside light and show a storage apparently wider than as it is so as not to give customers a sense of oppression as far as possible by providing a guard in the vicinity of the outside light in order to prevent collision of the outside light with the reinforcement bar for a night cover.

A reflecting board 16 having a recessed form is downwardly provided at the end portion of a ceiling board 1A of a main body, and an outside light 17 and an accommodating portion 18A for a night cover 18 are fixed below the reflecting board 16. The night cover accommodating portion 18A winds up and accommodates the night cover 18 and is arranged below the recessed portion of the reflecting board 16 and in the vicinity of a cooling air diffuser 8. Further, a transverse reinforcement bar 19 is provided at the end of the night cover 18 with a handle 20 being attached thereto to be grasped with hand at the time of drawing the night cover 18. Furthermore, a guard 24 is provided so that the handle 20 is prevented from colliding against a fluorescent light 23 when the handle 20 is positioned at the side of the fluorescent light 23 of the outside light 17 at the time of accommodating the night cover 18.