Composite seal member

A composite seal member that is mounted in a seal groove provided in a body surface of a first member and that establishes a sealed state between the first member and a second member when the second member is moved closer toward the first member, characterized in that

• the composite seal member includes
• a first seal member disposed on a side of a first side wall of the seal groove and made of an elastic member, and
• a second seal member disposed on a side of a second side wall of the seal groove and made of a material that is harder than the first seal member,
• the second seal member has at least
• a second side wall abutment surface that extends generally in parallel with and makes surface contact with the second side wall of the seal groove, and
• a seal abutment surface that extends generally in parallel with a seal surface of the second member, and that makes surface contact with the seal surface of the second member in the sealed state, and
• the first seal member has at least
• a seal projecting portion that projects toward the seal surface of the second member with respect to the body surface of the first member,
• a lateral swelling portion that swells toward the first side wall of the seal groove,
• a bottom portion that abuts against a bottom surface of the seal groove, and
• a placement portion for placement of the second seal member,
• wherein a recessed portion is provided between the seal projecting portion and the placement portion.