Sealing device

A sealing device (1) for sealing an annular gap formed between a reciprocating shaft (10) and a housing (11) in a fuel pump comprises a first sealing part (2) which includes a resin sealing member (21) coming into slidable sealing contact with the surface of the shaft (10), and an urging member (22) for urging the resin sealing member (21) toward the surface of the shaft (10), wherein the first sealing part (2) seals the side to be sealed where fuel exists, and a second sealing part (3) disposed on the side of the first sealing part (2) opposite from the side to be sealed for sealing fuel depressurized at the first sealing part (2), wherein the sealing device further comprises a seal retaining member (4).