Sealing device

A sealing device that seals a gap between an outside surface of a member performing whirling motion such as a rotary engine rotor and a stationary-side member, the device comprising:

• an oil seal member provided at the outside surface of the member performing whirling motion,
• the oil seal member having a sliding face that slides relatively to the stationary-side member, the sliding face being provided with a step extending circumferentially, and having a relatively high surface formed on one radial side with respect to the step and a relatively low surface on the other radial side, the high surface being provided with pumping grooves to pump oil tending to leak from the high surface side into the low surface side, into the high surface side by sliding relatively to the stationary-side member.