Sealing device

A sealing device for sealing a clearance between a housing and a rotational shaft disposed in a housing, the sealing device comprising:

• an annular mounted part being to be mounted to an inner peripheral surface of the shaft hole:
• a cylindrical part disposed radially inside the mounted part;
• a seal lip portion extending from the cylindrical part and being to be in contact with an outer peripheral surface of the rotational shaft;
• a bellows part connecting the mounted part to the cylindrical part;
• and
• an annular sliding member made of a resin and disposed radially inside the cylindrical part, the outer peripheral surface of the rotational shaft being to slide on the annular sliding member,
• the cylindrical part, the seal lip portion, and the bellows part being made of an elastic material having an elasticity that is higher than that of the resin,
• the cylindrical part comprising a projecting portion projecting radially inward, the projecting portion being an annular projection extending continuously in a circumferential direction, or comprising a plurality of projections arranged at intervals in a circumferential direction, the projecting portion comprising two surfaces perpendicular to the rotational shaft,
• a circumferential groove being formed on an outer peripheral surface of the sliding member, the circumferential groove comprising a cylindrical bottom peripheral surface and two side walls perpendicular to the bottom peripheral surface,
• the projecting portion being fitted into the circumferential groove, the two surfaces of the projecting portion being in contact with the two side wall surfaces of the circumferential groove, respectively.