A composite absorption type heat pump device, comprising: an exhaust gas flow path unit through which exhaust gas of an engine flows; a regenerator which includes a regeneration unit which heats a mixed solution of an absorbing solution and a diluent by the exhaust gas, and separates the mixed solution heated in the regeneration unit into the diluent having a gas phase and the absorbing solution having a liquid phase; a condenser which includes a cooling path through which a coolant flows, and condenses the diluent to obtain the diluent having a liquid phase by performing heat exchange of the dilute having a gas phase obtained in the regenerator and the coolant; an evaporator which evaporates the diluent having a liquid phase obtained in the condenser to obtain the diluent having a gas phase; an absorber which causes the diluent to absorb the absorbing solution to obtain the mixed solution and supplies the obtained mixed solution to the regenerator, by bringing the absorbing solution having a liquid phase obtained in the regenerator in contact with the diluent having a gas phase obtained in the evaporator; and a cooler which cools the coolant by performing heat exchange of the coolant which flows through the cooling path and external air, characterized in that the regeneration unit includes an exhaust heat recovery unit which includes an exchange unit which is communicated with the exhaust gas flow path unit and to which the exhaust gas flows in, and a mixed solution flow path unit which is thermally connected to the exchange unit and through which the mixed solution flows, and heats the mixed solution by performing heat exchange of the exhaust gas and the mixed solution and condenses vapor contained in the exhaust gas to obtain a condensed water, and a cooling unit which evaporates the condensed water obtained in the exhaust heat recovery unit, in the cooler. an exhaust gas flow path unit through which exhaust gas of an engine flows; a regenerator which includes a regeneration unit which heats a mixed solution of an absorbing solution and a diluent by the exhaust gas, and separates the mixed solution heated in the regeneration unit into the diluent having a gas phase and the absorbing solution having a liquid phase; a condenser which includes a cooling path through which a coolant flows, and condenses the diluent to obtain the diluent having a liquid phase by performing heat exchange of the dilute having a gas phase obtained in the regenerator and the coolant; an evaporator which evaporates the diluent having a liquid phase obtained in the condenser to obtain the diluent having a gas phase; an absorber which causes the diluent to absorb the absorbing solution to obtain the mixed solution and supplies the obtained mixed solution to the regenerator, by bringing the absorbing solution having a liquid phase obtained in the regenerator in contact with the diluent having a gas phase obtained in the evaporator; and a cooler which cools the coolant by performing heat exchange of the coolant which flows through the cooling path and external air, characterized in that the regeneration unit includes an exhaust heat recovery unit which includes an exchange unit which is communicated with the exhaust gas flow path unit and to which the exhaust gas flows in, and a mixed solution flow path unit which is thermally connected to the exchange unit and through which the mixed solution flows, and heats the mixed solution by performing heat exchange of the exhaust gas and the mixed solution and condenses vapor contained in the exhaust gas to obtain a condensed water, and a cooling unit which evaporates the condensed water obtained in the exhaust heat recovery unit, in the cooler.