To blow cold air uniformly from side to side for uniform cooling in a container by forming a cold air passage through which the cold air from an evaporator is directly blown downward.

This refrigerating device 11 for the container mounted in the container 10 for cooling a container room comprises the evaporator 4 arranged at the upper part of a casing of the refrigerating device 11, an air guide plate 23 laid from side to side on the lower part of the evaporator 4, a heat insulating board 59 erected at the end of the air guide plate 23 to form a wall face continuously tending downward, a bulkhead 58 erected in opposition to the heat insulating board 59, and the serial cold air passage 82 formed on the upper face of the air guide plate 23 and in a space between the heat insulating board 59 and the bulkhead 58.