PURPOSE: To solve difficulties with the prior art that in open show cases where a condensation unit is provided therein an inner box bottom plate is pushed up owing to both condensation unit and cooling uniy so that the inside of the case becomes shallow with reduced volume in the apparatus, and a usage efficiency of a space upon installation is lower.

CONSTITUTION: A bottom plate 21 of an outer box 2 of a body case 1 of an open show case is formed having a step H longitudinally, i.e., in the interior direction, and a base 8a is provided below a higher bottom plate 21b and a condensation unit such as a condenser 9 is disposed in the base 8a. In contrast, a cooling unit such as a condenser 6 fan 7 is disposed in a cold air circulation passage 5 above a lower bottom plate 2la. Hereby, a bottom plate of an inner box 3 is made lower substantially corresponding to the step H to permit the inside 4 of the apparatus to get deep and hence a volume inside the apparatus to be increased. Usage efficiency of a space is improved owing to the increase of the in-apparatus volume and many commodities are accomodated at a time so that the number of replenishments of commodities is reduced to improve the sales efficiency of commodities.