A plate-type heat exchanger (100, 101) comprising: a first heat exchanging unit and a second heat exchanging unit each having a plurality of heat transfer plates stacked in a first direction; and a partition plate disposed between the first heat exchanging unit and the second heat exchanging unit in the first direction, the partition plate having a first side and a second side in the first direction, the first side facing the heat transfer plates of the first heat exchanging unit, the second side facing the heat transfer plates of the second heat exchanging unit, the first heat exchanging unit having a first flow path in which a first fluid flows in a second direction crossing the first direction, and a second flow path in which a second fluid flows in a third direction crossing the first direction, the first flow path or the second flow path being provided between heat transfer plates adjacent in the first direction among the plurality of heat transfer plates, the first flow path and the second flow path being provided alternately in the first direction, the second heat exchanging unit having a third flow path in which the first fluid flows in a fourth direction crossing the first direction, and a fourth flow path in which a third fluid flows in a fifth direction crossing the first direction, the third flow path or the fourth flow path being provided between heat transfer plates adjacent in the first direction among the plurality of heat transfer plates, the third flow path and the fourth flow path being provided alternately in the first direction, the partition plate being provided with a flow port via which the first fluid flows from the first flow path to the third flow path, a distance from at least a portion of the first flow path to the partition plate being shorter than a distance from the second flow path to the partition plate, and a distance from at least a portion of the third flow path to the partition plate being shorter than a distance from the fourth flow path to the partition plate, characterized in that a thickness of the partition plate in the first direction being thinner than a thickness of the heat transfer plate in the first direction. a first heat exchanging unit and a second heat exchanging unit each having a plurality of heat transfer plates stacked in a first direction; and a partition plate disposed between the first heat exchanging unit and the second heat exchanging unit in the first direction, the partition plate having a first side and a second side in the first direction, the first side facing the heat transfer plates of the first heat exchanging unit, the second side facing the heat transfer plates of the second heat exchanging unit, the first heat exchanging unit having a first flow path in which a first fluid flows in a second direction crossing the first direction, and a second flow path in which a second fluid flows in a third direction crossing the first direction, the first flow path or the second flow path being provided between heat transfer plates adjacent in the first direction among the plurality of heat transfer plates, the first flow path and the second flow path being provided alternately in the first direction, a first flow path in which a first fluid flows in a second direction crossing the first direction, and a second flow path in which a second fluid flows in a third direction crossing the first direction, the first flow path or the second flow path being provided between heat transfer plates adjacent in the first direction among the plurality of heat transfer plates, the first flow path and the second flow path being provided alternately in the first direction, the second heat exchanging unit having a third flow path in which the first fluid flows in a fourth direction crossing the first direction, and a fourth flow path in which a third fluid flows in a fifth direction crossing the first direction, the third flow path or the fourth flow path being provided between heat transfer plates adjacent in the first direction among the plurality of heat transfer plates, the third flow path and the fourth flow path being provided alternately in the first direction, a third flow path in which the first fluid flows in a fourth direction crossing the first direction, and a fourth flow path in which a third fluid flows in a fifth direction crossing the first direction, the third flow path or the fourth flow path being provided between heat transfer plates adjacent in the first direction among the plurality of heat transfer plates, the third flow path and the fourth flow path being provided alternately in the first direction, the partition plate being provided with a flow port via which the first fluid flows from the first flow path to the third flow path, a distance from at least a portion of the first flow path to the partition plate being shorter than a distance from the second flow path to the partition plate, and a distance from at least a portion of the third flow path to the partition plate being shorter than a distance from the fourth flow path to the partition plate, characterized in that a thickness of the partition plate in the first direction being thinner than a thickness of the heat transfer plate in the first direction.