An object is to provide a fuel supply apparatus that is configured to enhance the strength of a fitting portion of a filler neck body that is fit in a tube. The fuel supply apparatus (FS) comprises a filler neck body (110) that is configured to include a hollow fuel passage-forming portion (110a) arranged to define a fuel passage (100P) which a supplied fuel passes through, and a fitting portion (111) configured to be fit in a tube (40) arranged to introduce the supplied fuel to a fuel tank (FT); a nozzle guide (150) that is placed inside of the fuel passage-forming portion (110a) and is configured to introduce a fueling nozzle (NZ) for supplying the fuel; and a first rib (151) that is provided at a position opposite to the fitting portion (111) to be placed between the filler neck body (110) and the nozzle guide (150) and to be in contact with an outer circumferential surface of the nozzle guide (150).