Electric component unit, and heat source unit for refrigeration cycle apparatus

A heat source unit for a refrigerant cycle apparatus, comprising:

• a heat source casing;
• and
• an electric component unit housed in the heat source casing and that comprises:
• a first electric board;
• a second electric board;
• a mounting member having:
• a first surface on which the first electric board is disposed, and
• a second surface on which the second electric board is disposed;
• and
• an electric component casing having a maintenance opening, wherein
• the mounting member is coupled to the electric component casing via a coupling portion,
• the electric component unit switches between a first state and a second state by rotation of the mounting member about the coupling portion,
• in the first state, the second electric board is accessible through the maintenance opening, and the first electric board, the second electric board, and the mounting member are all housed in the electric component casing, and
• in the second state, the first electric board is accessible through the maintenance opening.