Sealing device

A sealing device for sealing an annular gap between a shaft and a housing configured to move relatively, the sealing device comprising:

• a metal ring configured to be fitted to an inner surface of a shaft hole provided in the housing;
• a resin seal having a plate-shaped and annular resin member that is flat in an undeformed state, the resin seal being fixed to the metal ring on the radially outward side, and the resin seal being deformed, when the shaft is inserted, on the radially inward side to be curved toward a sealed-region side and, in this state, slidably in close contact with an outer surface of the shaft, wherein in an undeformed state the resin seal has a first width in a radial direction;
• and
• a plate spring having a plate-shaped annular metal member having a plurality of radially inward side slits and a plurality of radially outward side slits, the plurality of inward side slits separating the plate spring into a plurality of spring members that are free from a garter spring, the plate spring being fixed to the metal ring on the radially outward side, the plate spring being deformed, when the shaft is inserted, on the radially inward side to be curved along the resin seal, and the plurality of spring members pressing a radially inward side of the resin seal radially inward, wherein in an undeformed state the plate spring has a second width in a radial direction that is smaller than the first width, wherein
• a distal end of the plurality of spring members has a biting-suppression structure including an outward incline that extends away from the curved resin seal so as to be configured to prevent the distal end of the plurality of spring members from biting into the resin seal, wherein in an installed state on the shaft an axial length of the plurality of spring members are shorter than an axial length of the resin seal.