Stacking-type header, heat exchanger, and air-conditioning apparatus

A stacking-type header comprising a plurality of first plates and a plurality of second plates stacked on one another, the plurality of second plates each being disposed between adjoining two of the plurality of first plates,

• the plurality of first plates including
• a first end plate being an outermost one of the plurality of first plates in a stacking direction of the plurality of first plates, the first end plate having a single first through hole, and
• a second end plate being an other outermost one of the plurality of first plates in the stacking direction of the plurality of first plates, the second end plate having a plurality of second through holes,
• the plurality of first plates and the plurality of second plates having a communication hole, the communication hole connecting the first single through hole of the first end plate and the plurality of second through holes of the second end plate,
• the plurality of second plates each having at least one opening formed at other than the communication hole, the at least one opening communicating with atmosphere,
• wherein
• the plurality of first plates have connection holes through which the at least one opening communicates with the atmosphere,
• the at least one opening comprises a plurality of openings,
• the plurality of openings and the connection holes communicate with one another to form a connection passage, and
• the connection passage is connected to one atmosphere open hole that communicates with the atmosphere.