A plunger seal (1) for a pump, which is used for a fuel injection pump for a direct-injection gasoline engine, in which, even if a resin material is used as a fuel seal member (12), the plunger seal can be made compact, sealing ability is increased, and assembling man-hours can be reduced, and in which set sealing performance can be achieved when a U-shaped elastic member (33) for applying an urging force is used in a groove (41) formed in the fuel seal member (12). The resin fuel seal member (12) and an oil seal member (13) are assembled to form one seal system. Further, when the U-shaped elastic member (33) is installed in the groove (41), the axial position (L1) of an end surface (44a) that is on the side opposite the side to be sealed and belongs to a flange (44) for fixation formed on the inner peripheral surface of the groove (41) is positioned more on the side (B) opposite the side to be sealed than the axial position (L2) of a head section (15b) of a seal lip (15) of the fuel seal member (12).