To promptly discharge rainwater entered from an opening provided in a storage case and to suppress malfunction and durability fall resulting from the rainwater.

A compressor 3 and a sealant container 6 housing a sealant are housed in a storage case 2. The storage case 2 includes a rectangular box shape with vertical flatness and is provided with, at one side plate side, a case body 12 which includes an gateway 11 where the sealant container 6 can enter and leave from below and a bottom lid 14 which can be attached to the gateway 11 with freely attaching/detaching methods via a restraining means 13. The case body 12 is provided with a stiffening rib 30 which slightly rises from a bottom plate 12b and joins a front plate 12c and a back plate 12d. The stiffening rib 30 includes a through-hole 37 at an intersection with the bottom plate 12b and the through-hole 37 forms a first drainage R1 which extends from another side plate 12e2 to a restraining port 29 of the restraining means 13 through a bottom plate 12b upper surface and which can discharge the rainwater entered in the storage case 2 from the restraining port 29.