GASKET AND THROTTLE BODY

A gasket which is mounted in a groove formed in a first member and is elastic and which seals between the first member and a second member, including: a first contact section that comes in contact with the second member; a second contact member that comes in contact with one sidewall surface of the groove which is formed in such a way that a width of the groove becomes larger toward an opening section of the groove from a bottom of the groove; a third contact section that comes in contact with another sidewall surface of the groove which is formed in such a way that a width of the groove becomes larger toward the opening section from the bottom; and a fourth contact section that comes in contact with the bottom.