A method of manufacturing a hollow structural body

A method of manufacturing a hollow structural body, which comprises: - a fluorination treatment, wherein a structure body made of a hydrocarbon polymer or a polymer containing a introduced into the hydrocarbon polymer nitrogen-containing group, a silicon-containing group, an oxygen-containing group, a phosphorus-containing group or a sulfur-containing group under predetermined conditions with a fluorine-containing treatment gas is brought into contact, so that the treatment gas can penetrate from the outside to the inside in the structural body, so that the structural body, apart from its central region, is fluorinated; and - a removal step in which the middle portion is removed in non-fluorinated state.