A plate heat exchanger (2, 2A) comprising: a plate stack including a plurality of heat transfer plates (220, 230) stacked with each other, each of the heat transfer plates (220, 230) including a heat medium inflow hole serving as an inlet for a heat medium, a heat medium outflow hole serving as an outlet for the heat medium, a refrigerant inflow hole serving as an inlet for refrigerant, and a refrigerant outflow portion located below the refrigerant inflow hole and serving as an outlet for the refrigerant, the heat transfer plates (220, 230) defining a plurality of heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and a plurality of refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward, each of the heat medium passages and the refrigerant passages being defined between adjacent ones of the heat transfer plates (220, 230) such that the heat medium passage and the refrigerant passage are arranged alternately with one another; and a refrigerant outlet nozzle attached to the plate stack and projecting from the plate stack along a stacking direction of the heat transfer plates (220, 230), the refrigerant outlet nozzle being configured to let therethrough the refrigerant, leaving the refrigerant outflow portion, out of the plate stack, at least one heat transfer plate of the heat transfer plates (220, 230) including a refrigerant outflow hole located above a bottom portion for the refrigerant passages, the refrigerant outlet nozzle including a projection projecting upward from the inner surface of the refrigerant outlet nozzle characterised in that a lower part of the refrigerant outflow portion is located above a lower part of an inner surface of the refrigerant outlet nozzle. a plate stack including a plurality of heat transfer plates (220, 230) stacked with each other, each of the heat transfer plates (220, 230) including a heat medium inflow hole serving as an inlet for a heat medium, a heat medium outflow hole serving as an outlet for the heat medium, a refrigerant inflow hole serving as an inlet for refrigerant, and a refrigerant outflow portion located below the refrigerant inflow hole and serving as an outlet for the refrigerant, the heat transfer plates (220, 230) defining a plurality of heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and a plurality of refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward, each of the heat medium passages and the refrigerant passages being defined between adjacent ones of the heat transfer plates (220, 230) such that the heat medium passage and the refrigerant passage are arranged alternately with one another; and a heat medium inflow hole serving as an inlet for a heat medium, a heat medium outflow hole serving as an outlet for the heat medium, a refrigerant inflow hole serving as an inlet for refrigerant, and a refrigerant outflow portion located below the refrigerant inflow hole and serving as an outlet for the refrigerant, the heat transfer plates (220, 230) defining a plurality of heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and a plurality of refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward, each of the heat medium passages and the refrigerant passages being defined between adjacent ones of the heat transfer plates (220, 230) such that the heat medium passage and the refrigerant passage are arranged alternately with one another; and a plurality of heat medium passages, through each of which the heat medium flowing from the heat medium inflow hole flows, and a plurality of refrigerant passages, through each of which the refrigerant flowing from the refrigerant inflow hole flows downward, each of the heat medium passages and the refrigerant passages being defined between adjacent ones of the heat transfer plates (220, 230) such that the heat medium passage and the refrigerant passage are arranged alternately with one another; and a refrigerant outlet nozzle attached to the plate stack and projecting from the plate stack along a stacking direction of the heat transfer plates (220, 230), the refrigerant outlet nozzle being configured to let therethrough the refrigerant, leaving the refrigerant outflow portion, out of the plate stack, at least one heat transfer plate of the heat transfer plates (220, 230) including a refrigerant outflow hole located above a bottom portion for the refrigerant passages, the refrigerant outlet nozzle including a projection projecting upward from the inner surface of the refrigerant outlet nozzle characterised in that a lower part of the refrigerant outflow portion is located above a lower part of an inner surface of the refrigerant outlet nozzle.