Patent ID: 8863976

Claim:
A seal structure for a fuel tank comprising: a resin-made tank body containing an opening section having a neck section, the neck section protruding to an outside of the tank; a lid member closing the opening section; and a flange-equipped sleeve being interposed between the neck section and the lid member, wherein the lid member comprises: a tubular section which is housed inside the opening section; an external flange section which closes the top of the tubular section and is extended from the tubular section across an outer boundary of the neck section; and a seal-member mounting section which is extended downward from an outer edge of the external flange section and holds an annular seal member; wherein the flange-equipped sleeve comprises: a sleeve section which is attached to the neck section; and an internal flange section which is extended from the bottom of the sleeve section across the outer boundary of the neck section and is attached to an inner wall of the tank body; wherein the flange-equipped sleeve contains a resin having a higher heat-resistant temperature than a resin constituting the tank body; wherein when the lid member closes the opening section, the tubular section is housed inside the sleeve section; wherein the external flange section comes into contact with the top of the neck section and the sleeve section; and wherein an inner circumference of the seal member is attached to the outer boundary of the neck section.