A cooling structure for an electric vehicle, the cooling structure comprising: a power plant including an electric motor (20, 90) for traveling and a case covering the electric motor (20, 90); a coolant supplier (45b, 46, 86b) that supplies a coolant to the electric motor (20, 90); a heat exchanger; and a power supply circuit for supplying electric power to the electric motor (20, 90), characterized in that the cooling structure further comprises: a circulation fluid path (71, 72, 73) which circulates the coolant between the case of the electric motor (20, 90) and a case of the power supply circuit, and the heat exchanger; wherein the coolant supplier (45b, 46, 86b) supplies a non-conducting coolant to an electromagnetic coil (21a, 92a) of the electric motor (20, 90) and a substrate of a power supply circuit, wherein the coolant directly contacts the electromagnetic coil (21a, 92a) of the electric motor (20, 90) and the substrate of the power supply circuit; wherein the heat exchanger is disposed outside the case of the electric motor (20, 90) and the case of the power supply circuit, and is disposed so as to allow a traveling wind to pass through the heat exchanger; wherein an oil pan in which the coolant is stored is disposed underneath the case of the electric motor (20, 90). a power plant including an electric motor (20, 90) for traveling and a case covering the electric motor (20, 90); a coolant supplier (45b, 46, 86b) that supplies a coolant to the electric motor (20, 90); a heat exchanger; and a power supply circuit for supplying electric power to the electric motor (20, 90), characterized in that the cooling structure further comprises: a circulation fluid path (71, 72, 73) which circulates the coolant between the case of the electric motor (20, 90) and a case of the power supply circuit, and the heat exchanger; wherein the coolant supplier (45b, 46, 86b) supplies a non-conducting coolant to an electromagnetic coil (21a, 92a) of the electric motor (20, 90) and a substrate of a power supply circuit, wherein the coolant directly contacts the electromagnetic coil (21a, 92a) of the electric motor (20, 90) and the substrate of the power supply circuit; wherein the heat exchanger is disposed outside the case of the electric motor (20, 90) and the case of the power supply circuit, and is disposed so as to allow a traveling wind to pass through the heat exchanger; wherein an oil pan in which the coolant is stored is disposed underneath the case of the electric motor (20, 90). a circulation fluid path (71, 72, 73) which circulates the coolant between the case of the electric motor (20, 90) and a case of the power supply circuit, and the heat exchanger; wherein the coolant supplier (45b, 46, 86b) supplies a non-conducting coolant to an electromagnetic coil (21a, 92a) of the electric motor (20, 90) and a substrate of a power supply circuit, wherein the coolant directly contacts the electromagnetic coil (21a, 92a) of the electric motor (20, 90) and the substrate of the power supply circuit; wherein the heat exchanger is disposed outside the case of the electric motor (20, 90) and the case of the power supply circuit, and is disposed so as to allow a traveling wind to pass through the heat exchanger; wherein an oil pan in which the coolant is stored is disposed underneath the case of the electric motor (20, 90).