Plate-type heat exchanger, heat pump device, and heat-pump-type cooling and heating hot-water supply system

A plate-type heat exchanger comprising:

• a plurality of heat transfer plates stacked on top of each other;
• a flow passage, formed by each space between the plurality of heat transfer plates, through which a fluid flows in a first direction;
• an inner fin disposed in the flow passage;
• a first projecting portion provided on an inflow side of each of the heat transfer plates and configured to prevent the fluid from flowing into gaps between both ends of the inner fin in a second direction and both ends of the heat transfer plate in the second direction;
• and
• a second projecting portion formed on an outflow side of each of the heat transfer plates and configured to perform positioning in placing the inner fin into the heat transfer plate,
• the first direction being a direction of flow of the fluid through the flow passage,
• the second direction being a direction orthogonal to the first direction,
• the inner fin being disposed between the first projecting portion and the second projecting portion.