To provide a hollow device having a microchannel and capable of being simply manufactured, and its manufacturing method.

This hollow device 10 has a hollow fiber 12 having the microchannel 16 and a device main body forming part 14 around the hollow fiber 12. This manufacturing method of the hollow device 10 includes a process for arranging the hollow fiber 12 having the microchannel 16 in a desired shape, a process for introducing a device main body forming material around the hollow fiber 12, and a process for hardening or solidifying the device main body forming material to seal the hollow fiber 12 in the device main body forming part 14. It is desirable that a material of the hollow fiber 12 is resin, a carbon fiber, a composite material of resin and an inorganic material or glass.