A fuel inlet includes: an inlet pipe to form a path to guide fuel to a fuel tank; a breather tube to form a path to guide vapor in the fuel tank toward a distal end portion of the inlet pipe; and a retainer provided at a distal end portion of the inlet pipe and including: an attachment and detachment mechanism to attach and detach a fuel filler cap; a restriction mechanism to restrict a distal end position of a fuel filling gun; and an air vent hole to allow passage of the vapor supplied from the breather tube toward the distal end portion of the inlet pipe. The retainer includes a first component including the attachment and detachment mechanism and a second component secured to the first component and including the restriction mechanism. The air vent hole is a gap formed between the first component and the second component.