To provide an installing structure of a resin cylindrical body to a resin fuel tank superior in fuel low permeability of a cylindrical body installing part, particularly superior in gasoline fuel low permeability.
An opening part is constituted by integrally forming an annular projecting part 49 of a shaft directional both-end openings in an HDPE fuel tank 41 so as to project inside the fuel tank 41. A press-in part 59 of a PA filler hose installing pipe 53 is pressed in this annular projecting part 49, and is installed in the fuel tank 41. An annular projection 67 is formed on an outer peripheral surface of the press-in part 59, and this annular projection 67 is made to bite in an inner peripheral surface 51 of the annular projecting part 49.
ITO KIMIHIDE
ITO HIROAKI
