Lip Type Seal

A lip type seal comprising:

• a resin seal main body being installed in an annular gap between an operation member and a fixed member, having an approximately cylindrical concave portion which is open so as to face to a first sealed fluid side, and being integrally provided with a first inner peripheral seal lip and a first outer peripheral seal lip which are provided at inner and outer peripheries of said cylindrical concave portion and slidably contact with said operation member and the fixed member, and a plate-shaped second inner peripheral seal lip which is positioned at a second sealed fluid side opposite in an axial direction to the first sealed fluid side and extends diagonally in an inner peripheral direction toward the second sealed fluid side;
• and
• an elastic body inward installed to said cylindrical concave portion,
• wherein an outer peripheral side end portion of said second inner peripheral seal lip is brought into contact with a taper surface formed in said fixed member or an installation member which is fitted to said fixed member at a time when a pressure is applied from the first sealed fluid side, and contact surface pressure in an inner peripheral direction is applied to an inner peripheral side end portion of said second inner peripheral seal lip which slidably contacts with said operation member.