To provide a hot water supply system using soil heat which can be realized advantageously in cost, capable of efficiently taking out soil heat aboveground, and capable of efficiently using the soil heat to form hot water.

The hot water supply system using soil heat is provided with a water holding vessel 1 provided with a height size reaching a depth position receiving an effect of soil heat, a water supply pipe 2 connected to a water supply system and having a supply water discharge opening 2a opening into the vessel 1 in a lower end side of the vessel 1, and a hot water pumping pipe 3 extended to a hot water using side and having a hot water pumping opening 3a opening into the vessel 1 in an upper end side of the vessel 1. A heat pipe 4 extending from the lower end side to the upper end side and dissipating the soil heat absorbed from the lower end side from the upper end side is installed in water 5 of the water holding vessel 1.