Outdoor unit and refrigeration cycle apparatus

An outdoor unit, comprising:

• a heat exchanger including heat transmission fins and heat transmission pipes, the heat transmission fins being spaced from one another with a distance, fitted to and fixed to the heat transmission pipes, so that heat is exchanged between refrigerant passing through the heat transmission pipes and air passing between the heat transmission fins;
• an electric component including a part of an electric system that controls equipment;
• and
• a cooling member disposed in a channel of air passing through the heat exchanger, the cooling member configured to dissipate heat from the electric component to the air, wherein
• the heat transmission fins are fitted to the heat transmission pipes such that the distance between the heat transmission fins is configured to be larger, in a position corresponding to a position where the cooling member is located and that serves as a passage of the air passing through the cooling member, than in other positions in the heat exchanger.