PROBLEM TO BE SOLVED: To smoothly insert an oil filler gun irrespective of a diameter of the oil filler gun by forming an oil filler port seal sealing a clearance between the oil filler gun to be inserted into an oil filler port and it by a cylindrical film member which is made of an elastic material and is provided with a narrow part in close-contact with outer periphery of the oil filler gun. ;SOLUTION: An oil filler port seal 1 is provided with an expandable and cylindrical film member 2 made of a rubberlike elastic material and is integrally incorporated in a seal housing 3 constituting an oil filler port. This cylindrical film member 2 is provided with a narrow part 201 of which diameter is shrunk partially like a Japanese hand drum, and an inner peripheral diameter thereof is in close-contact with outer periphery of an oil filler gun 9 to be inserted into the oil filler port to seal therebetween. The narrow part 201 is formed in such a way that its diameter is shrunk like a recessed section toward a central axis C and a cross section thereof is like circular arc. An outer end part on an opening side A is a fixed end part 202 fixed in the axial direction for the seal housing 3 so as not to move, and an end part on a tank side 0 is a movable end part 203 attached in the axial direction for the seal housing 3 so as to move.;COPYRIGHT: (C)1999,JPO
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