The purpose of the present invention is to provide an exhaust heat recovery heat pump device such that the liquid compression of the high-stage compressor of a two-stage compressor can be reliably avoided when the high-stage compressor operates using, as a suction refrigerant, a mixed refrigerant of the intermediate-pressure refrigerant from a gas-liquid separator with the intermediate-pressure refrigerant from the low-stage compressor. This exhaust heat recovery heat pump device is equipped with a refrigerant adjustment mechanism which introduces a mixed refrigerant of the refrigerant discharged from the gas-side outlet of a gas-liquid separator 4 with the refrigerant compressed by a low-stage compression mechanism 1a into the suction opening of a high-stage compression mechanism 1b, the mixed refrigerant serving as a gas refrigerant having the degree of superheat that is a predetermined value or more. The refrigerant adjustment mechanism is equipped with: a level sensor 21 which is provided to the gas-liquid separator 4 so as to detect the liquid level; an opening and closing control valve 7 which is provided to an intermediate pipe L1; and a control unit 20 which controls the opening and closing control valve 7 to a closed position if the liquid level detected by the level sensor 21 reaches a predetermined position based on a gas-side communication port to the intermediate pipe L1.
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