A sealing apparatus for sealing a space between an outer periphery side member and an inner periphery side member at least partially enclosed by said outer periphery side member, the outer periphery side member and the inner periphery side member being mutually relatively rotatable about an axis (x), the sealing apparatus comprising: an annular reinforcement ring disposed around the axis (x); and an annular elastic body part attached to the reinforcement ring and disposed around the axis (x), the annular elastic body part being formed of an elastic body, a grease applied to a side lip, an intermediate lip and a grease lip, wherein the elastic body part has: the side lip extending toward one side (a) with respect to the axis (x) and being formed so as to contact the inner periphery side member from another side (b) with respect to the axis (x) in a usage state; the intermediate lip extending toward the one side (a) on an inner periphery side of the side lip and being formed so as to contact the inner periphery side member from the other side (b) in the usage state; and the grease lip extending toward the other side (b) on an inner side of the intermediate lip and being formed so as to slidingly contact an outer peripheral surface of the inner periphery side member in the usage state, the sealing apparatus being characterized in that in the usage state, in a first space enclosed by the side lip and the intermediate lip of the elastic body part and the inner periphery side member, a ratio of an application volume of the grease applied to the side lip to a spatial volume of the first space is above 0% and equal to or less than 21%, and in a second space enclosed by the intermediate lip and the grease lip of the elastic body part and the inner periphery side member, a ratio of an application volume of the grease applied to the intermediate lip and the grease lip is above 0% and equal to or less than 33% with respect to a spatial volume of the second space. an annular reinforcement ring disposed around the axis (x); and an annular elastic body part attached to the reinforcement ring and disposed around the axis (x), the annular elastic body part being formed of an elastic body, a grease applied to a side lip, an intermediate lip and a grease lip, wherein the elastic body part has: the side lip extending toward one side (a) with respect to the axis (x) and being formed so as to contact the inner periphery side member from another side (b) with respect to the axis (x) in a usage state; the intermediate lip extending toward the one side (a) on an inner periphery side of the side lip and being formed so as to contact the inner periphery side member from the other side (b) in the usage state; and the grease lip extending toward the other side (b) on an inner side of the intermediate lip and being formed so as to slidingly contact an outer peripheral surface of the inner periphery side member in the usage state, the sealing apparatus being characterized in that the side lip extending toward one side (a) with respect to the axis (x) and being formed so as to contact the inner periphery side member from another side (b) with respect to the axis (x) in a usage state; the intermediate lip extending toward the one side (a) on an inner periphery side of the side lip and being formed so as to contact the inner periphery side member from the other side (b) in the usage state; and the grease lip extending toward the other side (b) on an inner side of the intermediate lip and being formed so as to slidingly contact an outer peripheral surface of the inner periphery side member in the usage state, the sealing apparatus being characterized in that in the usage state, in a first space enclosed by the side lip and the intermediate lip of the elastic body part and the inner periphery side member, a ratio of an application volume of the grease applied to the side lip to a spatial volume of the first space is above 0% and equal to or less than 21%, and in a second space enclosed by the intermediate lip and the grease lip of the elastic body part and the inner periphery side member, a ratio of an application volume of the grease applied to the intermediate lip and the grease lip is above 0% and equal to or less than 33% with respect to a spatial volume of the second space.