A liquid temperature control apparatus comprising: a heat medium circulation apparatus equipped with a cooling unit in which a compressor, a condenser, an expansion valve (13, 13A-C), and a plurality of cooling heat exchangers (14, 14A-C) are connected by pipes in this order so as to circulate a heat medium, and equipped with a heating unit configured to allow a portion of the heat medium flowing out from the compressor to the condenser to be branched and return the heat medium so as to flow into the condenser on a downstream side of the compressor via a heating heat exchanger (21, 21A, 21B) and a heating amount adjustment valve (22, 23, 22A, 22B), said plurality of cooling heat exchangers (14, 14A-C) are arranged in parallel comprising a first cooling heat exchanger and a second cooling heat exchanger; and a liquid flow apparatus including a plurality of liquid flow paths to allow the liquid to flow, wherein a first liquid flow path among the plurality of liquid flow paths is connected to the first cooling heat exchanger so as to enable heat exchange between the liquid allowed to flow and the heat medium that flows through the first cooling heat exchanger among the plurality of cooling heat exchangers (14, 14A-C), while being connected to the heating heat exchanger (21, 21A, 21B) so as to enable heat exchange between the liquid allowed to flow and the heat medium that flows through the heating heat exchanger (21, 21A, 21B), the heating heat exchanger (21, 21A, 21B) being connected in series downstream of the first cooling heat exchanger, a second liquid flow path among the plurality of liquid flow paths is connected to the second cooling heat exchanger so as to enable heat exchange between the liquid allowed to flow and the heat medium that flows through the second cooling heat exchanger among the plurality of cooling heat exchangers (14, 14A-C), and an electric heater for heating the liquid allowed to flow is provided in the second liquid flow path, the electric heater includes a plurality of electric heaters; wherein the second liquid flow path includes a second main flow path including a connecting portion with the second cooling heat exchanger, between an upstream end and a downstream end of the second main flow path, and includes a plurality of second branch flow paths branching from the downstream end of the second main flow path, and the electric heaters are respectively provided in each of the plurality of second branch flow paths. a heat medium circulation apparatus equipped with a cooling unit in which a compressor, a condenser, an expansion valve (13, 13A-C), and a plurality of cooling heat exchangers (14, 14A-C) are connected by pipes in this order so as to circulate a heat medium, and equipped with a heating unit configured to allow a portion of the heat medium flowing out from the compressor to the condenser to be branched and return the heat medium so as to flow into the condenser on a downstream side of the compressor via a heating heat exchanger (21, 21A, 21B) and a heating amount adjustment valve (22, 23, 22A, 22B), said plurality of cooling heat exchangers (14, 14A-C) are arranged in parallel comprising a first cooling heat exchanger and a second cooling heat exchanger; and a liquid flow apparatus including a plurality of liquid flow paths to allow the liquid to flow, wherein a first liquid flow path among the plurality of liquid flow paths is connected to the first cooling heat exchanger so as to enable heat exchange between the liquid allowed to flow and the heat medium that flows through the first cooling heat exchanger among the plurality of cooling heat exchangers (14, 14A-C), while being connected to the heating heat exchanger (21, 21A, 21B) so as to enable heat exchange between the liquid allowed to flow and the heat medium that flows through the heating heat exchanger (21, 21A, 21B), the heating heat exchanger (21, 21A, 21B) being connected in series downstream of the first cooling heat exchanger, a second liquid flow path among the plurality of liquid flow paths is connected to the second cooling heat exchanger so as to enable heat exchange between the liquid allowed to flow and the heat medium that flows through the second cooling heat exchanger among the plurality of cooling heat exchangers (14, 14A-C), and an electric heater for heating the liquid allowed to flow is provided in the second liquid flow path, the electric heater includes a plurality of electric heaters; wherein the second liquid flow path includes a second main flow path including a connecting portion with the second cooling heat exchanger, between an upstream end and a downstream end of the second main flow path, and includes a plurality of second branch flow paths branching from the downstream end of the second main flow path, and the electric heaters are respectively provided in each of the plurality of second branch flow paths.