A mold cooling structure to cool a heating surface comprising: a first refrigerant flow channel through which a first refrigerant for cooling a mold flows; and a second refrigerant flow channel through which a second refrigerant for cooling the first refrigerant flowing through the first refrigerant flow channel flows, wherein the second refrigerant flow channel is disposed further distant from the heating surface than the first refrigerant flow channel, the first refrigerant flow channel and the second refrigerant flow channel are formed by disposing a partition in one penetrating hole, the second refrigerant flow channel extending along the first refrigerant flow channel, mutual heat exchange between the first refrigerant and the second refrigerant is performable via the partition, the first refrigerant and the second refrigerant flow in directions opposite to each other, an inflow port into which the refrigerant that flows through the first refrigerant flow channel flows and a discharge port out from which the refrigerant that flows through the second refrigerant flow channel is discharged are provided adjacent to each other with the partition disposed between the inflow port and the discharge port a cross-sectional area of the inflow port of the first refrigerant flow channel is larger than a cross-sectional area of the discharge port of the second refrigerant flow channel, and an inflow port into which the refrigerant that flows through the second refrigerant flow channel flows and a discharge port out from which the refrigerant that flows through the first refrigerant flow channel is discharged are provided adjacent to each other with the partition disposed between the inflow port and the discharge port, a cross-sectional area of the inflow port of the second refrigerant flow channel is larger than a cross-sectional area of the discharge port of the first refrigerant flow channel. a first refrigerant flow channel through which a first refrigerant for cooling a mold flows; and a second refrigerant flow channel through which a second refrigerant for cooling the first refrigerant flowing through the first refrigerant flow channel flows, wherein the second refrigerant flow channel is disposed further distant from the heating surface than the first refrigerant flow channel, the first refrigerant flow channel and the second refrigerant flow channel are formed by disposing a partition in one penetrating hole, the second refrigerant flow channel extending along the first refrigerant flow channel, mutual heat exchange between the first refrigerant and the second refrigerant is performable via the partition, the first refrigerant and the second refrigerant flow in directions opposite to each other, an inflow port into which the refrigerant that flows through the first refrigerant flow channel flows and a discharge port out from which the refrigerant that flows through the second refrigerant flow channel is discharged are provided adjacent to each other with the partition disposed between the inflow port and the discharge port a cross-sectional area of the inflow port of the first refrigerant flow channel is larger than a cross-sectional area of the discharge port of the second refrigerant flow channel, and an inflow port into which the refrigerant that flows through the second refrigerant flow channel flows and a discharge port out from which the refrigerant that flows through the first refrigerant flow channel is discharged are provided adjacent to each other with the partition disposed between the inflow port and the discharge port, a cross-sectional area of the inflow port of the second refrigerant flow channel is larger than a cross-sectional area of the discharge port of the first refrigerant flow channel.