To provide a showcase capable of arbitrarily changing a space between a heating chamber and a cooling chamber with a simple structure and preventing an appearance from being impaired.

This showcase comprises an air curtain unit 20 having an auxiliary cool air duct 21 allowed to communicate with a cool air duct 12 between the rear part 50 of a showcase body 10 and a rear panel 51 to lead cool air therein and an air curtain unit 20 and a diffuser 22 for blowing out cool air. The air curtain unit 20 is installed on the rear panel 51 detachably in vertical direction so as to be storably installed in a ceiling part 30. By leading cool air from the cool air duct 12 of the showcase body 10 therein, the entire part of a commodity exhibiting chamber 11 inside the showcase body 10 can be formed in the cooling chamber 11a.