To provide a heat transport device capable of easily constituting wick, stably circulating an operation fluid at the inside of the heat transport device and obtaining a high heat transport efficiency, and its manufacturing method.

The operation fluid of a liquid flowing in a liquid phase passage 5 toward an evaporator wick communication hole 10 is permeated to fine hole between fine particles filled in the evaporator wick communication hole 10 by capillary tube force and flows into the wick 15 of the evaporator 14. The operation fluid vaporized in the evaporator 14 is passed through a vapor phase passage 3 and flows into a condenser 16 through a condenser wick communication hole 13. In the condenser 16, the operation fluid is again liquified. The liquified operation fluid flows in the liquid phase passage 5 from the condenser 16 toward the evaporator wick communication hole 10. The capillary tube force is generated in the evaporator wick communication hole 10 filled with the fine particles and the operation fluid can be stably circulated in the heat transport device 1.