A fuel supply apparatus comprises a filler neck body including a fuel passage-forming structure configured to form a fuel passage and a fuel vapor port branched off from the fuel passage-forming structure; and a nozzle guide located inside of the filler neck body and formed in a tubular shape. A vapor flow path is formed to be continuous with the fuel vapor port and introduce fuel vapor flowing into the fuel vapor port in a tank direction. The configuration of the fuel supply apparatus enables the fuel vapor circulated from a fuel tank to the fuel supply apparatus to smoothly join with the flow of liquid fuel supplied from a fueling nozzle.