Outdoor unit for air-conditioning apparatus

An outdoor unit for an air-conditioning apparatus, the outdoor unit comprising:

• a casing having at least one air inlet through which air enters the casing;
• an air-sending device disposed in the casing and configured to create a flow of air passing through the at least one air inlet;
• a heat exchanger disposed between the casing and the air-sending device and exposed through the at least one air inlet, the heat exchanger including a plurality of fins spaced apart from each other;
• and
• a partition disposed in the casing and dividing a space in the casing into an air-sending device chamber containing the heat exchanger and the air-sending device and a machine chamber containing a compressor,
• the plurality of fins including an end fin group located at an end remote from the partition,
• the casing including a wall having at least one vent that faces the end fin group and that is located along a side edge part defining an edge of the at least one air inlet,
• the heat exchanger being I-shaped when the heat exchanger is viewed in a direction perpendicular to a base on which the heat exchanger and the air-sending device are arranged,
• the wall having the at least one vent being opposite a front wall having an air outlet through which air subjected to heat exchange is blown, and constituting a rear wall of the air-sending device chamber.