Stacked header, heat exchanger, and air-conditioning apparatus

A stacked header including a plurality of plates stacked together and branching one flow path into a plurality of flow paths, the stacked header comprising:

• an upper end part positioned at an upper end of the stacked header in a gravity direction;
• a lower end part positioned at a lower end of the distributor the stacked header in the gravity direction;
• and
• a flow path forming part positioned between the upper end part and the lower end part and having a flow path formed in the flow path forming part,
• at least one of the upper end part and the lower end part comprising a non-horizontal face part having a non-horizontal face slanted to a horizontal plane.