Patent ID: 7753431

Claim:
A gas fuel filler lid device for a vehicle using high pressure gas as a fuel, comprising: a fuel filler opening that is used when fueling the vehicle with the high pressure gas; the fuel filler opening having an annular terminal surface and a cylindrical outer surface; a lid that is mounted on the vehicle to cover the fuel filler opening such that the lid can be freely opened and closed; and a fuel filler opening cap that covers the cylindrical outer surface of the fuel filler opening to prevent foreign material from entering, wherein the fuel filler opening cap is mounted on an internal surface of the lid and includes, on an internal surface, a radially-inward projecting portion which contacts and seals with the outer surface of the fuel filler opening, and the fuel filler opening cap is attached to or detached from the outer surface of the fuel filler opening in conjunction with opening and closing movement of the lid.