Sealing device

A sealing device that seals an annular gap between a housing having a shaft hole, and a shaft configured to be inserted through the shaft hole and to rotate and deviate relative to the housing, the sealing device comprising:

• a fixed part fixed to an inner circumference of the shaft hole in the housing;
• a thin bellows part extending from the fixed part toward a surface of the shaft in a bellows shape;
• and
• a sealing part provided on a radially inner side of the bellows part and slidably contacting an outer circumferential surface of the shaft,
• the bellows part including,
• on one side thereof, circumferentially alternating ridges extending continually radially from outside at the fixed part to inside at the sealing part and grooves extending continually radially from outside at the fixed part to inside at the sealing part, and
• on the other side, grooves and ridges that are exact backsides of the ridges and grooves on the one side of the bellows part, respectively, and
• the bellows part being formed to have a substantially equal thickness over an entire circumference thereof.