Patent ID: 7025222

Claim:
A cap device that is detachable to a tank opening and located on a vehicle body member, the cap device comprising: a closer that closes the tank opening; a torque member that is attached to the closer; a cover that is mounted on the torque member and has a handle to operate the closer; and a tether mechanism that is attached to the torque member, wherein the tether mechanism includes: a tether rotation support slidably supported on an outer circumference of the torque member; and a long flexible connector member having a first connecting end and second connecting end, the first connecting end being linked with the connector member, the second connecting end being used for connection with the vehicle body member, the torque member being made of a resin material having a liquid swelling property substantially equal to or less than that of the tether rotation support, wherein the tether rotation support includes a ring main body and interlocking projections protruded from an inner wall of the ring main body, and the torque member includes interlocking claws formed on an outer wall of the torque member, the interlocking projections being configured to engage with the interlocking claws, the tether rotation support being rotatably supported to the torque member.