An ejector cycle device includes a compressor, a refrigerant radiator, an ejector having a nozzle part and a refrigerant suction port, and a branch passage for introducing refrigerant branched on an upstream side of the nozzle part of the ejector in a refrigerant flow into the refrigerant suction port. Furthermore, a first evaporator is arranged on a downstream side of the ejector in the refrigerant flow, and a second evaporator is arranged in the branch passage. In addition, in the ejector cycle device, a refrigerant flow rate ratio (α) of a flow rate of refrigerant flowing in the second evaporator to a flow rate of refrigerant discharged from the compressor is set within a range from 0.07 or more to 0.93 or less. In this case, COP of the ejector cycle device can be effectively improved.