The purpose of the invention is, in a sealing device comprising a main lip to seal a sealing fluid inside an apparatus and an auxiliary lip to prevent intrusion of foreign bodies from outside the apparatus, to prevent occurrences of lip curling on the auxiliary lip and achieve both shaft insertion properties and sealing properties even when a shaft is inserted from the auxiliary lip side relative to the sealing device and the shaft insertion is misaligned to a large degree. To achieve this purpose, a sealing device comprising a main lip to seal a sealing fluid inside an apparatus and an auxiliary lip to prevent intrusion of foreign bodies from outside the apparatus and having a structure that allows both lips to slidably contact the circumferential face of a shaft is characterized in that the auxiliary lip is formed to be perpendicular to the axial direction or formed to face the main lip side and the auxiliary lip is provided with a stepped shape to unevenly distribute, toward the outside the apparatus, the location where the contact pressure peak is generated on the shaft in the auxiliary lip.