A cooling unit having, on two sides, supporting C-shaped lateral frames. The lateral frames are formed from frame profiles having a rear-sided vertical profile and a lower and an upper forward-projecting horizontal profile. A rear wall group having a heat-insulating outer covering is mounted on the vertical profiles, a base group is mounted on the lower horizontal profile and an upper group is mounted on the upper horizontal profile, and the groups surround a cooling chamber from behind, below and above. The construction has at least the outer covering of the rear wall group arranged on the inner side, facing the cooling chamber, of the vertical profile.