FILLER NECK

PROBLEM TO BE SOLVED: To provide a filler neck in which a metal retainer is not easily peeled from a neck body 20 and the sealability is not likely to be impaired even when a resin of a pipe body is exposed to a fuel and is subject to fuel swelling.SOLUTION: A filler neck 10 includes: a neck body 20 including a resin inner layer 28 and a resin outer layer 29 which have pipe shapes; and a metal retainer 30 which is attached so as to cover an end part of the neck body 20. One of the resin inner layer 28 and the resin outer layer 29 is formed by a resin material which is more excellent in fuel permeability resistance than the other layer. The resin inner layer 28 has a screw part 21a for screwing a screw part FCa of a fuel cap on an inner wall of the resin inner layer 28. The retainer 30 includes: a seal part 32 which seals a space between the retainer 30 and a gasket; and a cylindrical outer periphery protection part 31. The outer periphery protection part 31 is provided extending to a position going beyond a surface which is arranged perpendicular to a center axis of a fuel passage 10P and includes the screw part 21a.