To provide a burying method for a heat collection pipe used for an underground heat system allowing low-cost construction even in a dense residential area or a narrow area, and capable of performing efficient heat exchange.

In this burying method for the heat collection pipe 7 used for the underground heat system connected with a heat exchanger 5, feeding a cooling medium heat-exchanged by the heat exchanger 5 into the ground 6 to perform the heat exchange, a pit 20 allowing vertical burying of the heat collection pipe 7 wound in a loop state is dug out in land, and the heat collection pipe 7 is buried in the dug-out pit 20 in a state that a loop portion 7C of the heat collection pipe 7 is held such that the loop portion 7c is horizontally shifted and comes into a vertical state.