Patent attributes
A gasket to securely contact a box type body when both a body and a cover are downsized and thinned. Fluid leakage is prevented through a seal by lessening repulsion of the seal at the time of sealing clearance between. A clearance between the box type body and the cover is made such that a main body is adhered to a bottom surface of the cover having a peripheral wall. A step face is formed by the main body and a lip portion formed at the tip side of the main body. A contact surface is formed by a side wall of the main body and a peripheral wall. The step surface is positioned outside with respect to the lip portion.