To provide a heat radiation pipe device utilizing the underground heat capable of preventing the unevenness in snow melting and space heating by arbitrarily supplying a proper amount of heat medium to all of heat radiation pipes.

In this heat radiation pipe device utilizing underground heat wherein the underground heat is collected by the heat medium supplied to a heat exchanger 2 vertically buried in the ground, the heat medium is supplied to a number of heat radiation pipes 1 meandering like a hairpin just under a road surface S and the like, through a feed pipe 3 and a return pipe 4, and the heat is released to melt the snow and the like, a header 5 is mounted between terminal parts of the feed pipe 3 and the return pipe 4 and each heat radiation pipe 1 to mount a flow adjusting valve 6.