To save the power consumption of an antisweat heater provided on a front decorative panel of an upper case of a dual type show case.

In a dual type freezing/refrigerating show case in which a reach-in type show case on the upper stage is combined with a flat type open show case on the lower stage, a front decorative panel having an antisweat heater 6 is provided on a front part of an upper case facing an upper opening of a lower case, and an in-case lamp 4 for the lower case is provided on a forward part of the decorative panel. Energization to the antisweat heater is stopped when the lamp is lit (while the shop is open) in the operating condition of the show case. When the lamp is turned off (when the shop is closed), a switch 12 is connected between a power feeding circuit for the in-case lamp and the antisweat heater and the power source as a sequence control means to energize the antisweat heater, condensation of the decorative panel is prevented by the heat generation of the lamp while the lamp is lit, and condensation of the decorative panel is prevented by energizing the antisweat heater during the period while the lamp is turned off.