To permit the reduction of frequent water leakage repairing works as much as possible.

In the structure of an ice storehouse 3, constituted of an outer casing 13, an inner casing 14, inserted into the outer casing 13, and heat insulating material 15, provided between the inner casing 14 and the outer casing 13 while storing ice produced by an ice making mechanism, the inner casing 14 is constituted of a bottom plate 24, left and right plates 25, 26 as well as a rear plate 27, which are established at the ends of the bottom plate 24, and waterproof packings 28, provided between the bottom plate 24 and the left-and- right plates 25, 26 as well as the rear plate 27.