To provide a cooling unit installation structure of a showcase facilitating the installation work of a cooling unit in a machine chamber and its removal work from the machine chamber.

This cooling unit installation structure of the showcase 1 stores the cooling unit 4 from the front surface of the machine chamber 3 and the bottom of the machine chamber is provided with a slope member 33, as the cooling unit is inserted in the machine chamber, obliquely upward guiding the rear side bottom of the cooling unit 4 so that the cooling unit 4 abuts on a ceiling part side of the machine chamber 4. When the cooling unit 4 is inserted from the front surface to the rear surface of the machine chamber 3, the rear side bottom of the cooling unit 4 is thus guided by the slope member 33 and obliquely upward moved. This constitution can make the rear side upper end of the cooling unit 4 to abut on the ceiling part of the machine chamber 4 and fix the rear end of the cooling unit to the ceiling part of the machine chamber 3.