An integrated unit for a refrigerant cycle device includes an ejector having a nozzle part for decompressing refrigerant, and an evaporator located to evaporate the refrigerant to be drawn into a refrigerant suction port of the ejector or the refrigerant discharged from an outlet of the ejector. The evaporator includes a plurality of tubes defining refrigerant passages through which refrigerant flows, a tank that is disposed at one end side of the tubes for distributing refrigerant into the tubes and for collecting the refrigerant from the tubes. The tank extends in a tank longitudinal direction that is parallel to an arrangement direction of the tubes, and is provided with an end portion in the tank longitudinal direction. Furthermore, the end portion has a hole portion for inserting the ejector, and the ejector is inserted into an inner space of the tank from the hole portion.