PROBLEM TO BE SOLVED: To provide a heat pipe capable of elongating the heat transport distance.
SOLUTION: A double pipe structure heat pipe 1 comprising an outer pipe 2 and an inner pipe 3 in that a first channel L1 formed between the outer pipe 2 and the inner pipe 3 and a second channel L2 formed on the inside of the inner pipe 3 are communicated with each other at both ends, comprises: heating means 4 for forming a heating area in the outer pipe 2 by heating the circumference of one end side of the outer pipe 2; cylindrical magnetic field application means 6 provided at one end of the inner pipe 3 for applying the magnetic field on the first channel L1 and the second channel L2; and magnetic fluid containing magnetic particles whose magnetization decreases with increasing temperature and base liquid for circulating through the first channel L1 and the second channel L2 by being enclosed in the outer pipe 2.
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