It is an object of the present invention to provide a rolling bearing in which
efficacy provided by an auxiliary agent for
grease can be maintained for a long time to extend its life and a seal for the rolling bearing. A rolling bearing (1) has an inner ring (2); an outer ring (3); a plurality of rolling elements (4) interposed between the inner ring (2) and the outer ring (3); a
retainer (5) retaining the rolling elements (4); and a seal (6) provided at an open portion, of the inner ring (2) and the outer ring (3), which is disposed at both axial ends thereof. The rolling bearing (1) is lubricated with a
grease (8) enclosed in a space, inside the bearing, which is constructed of the inner ring (2), the outer ring (3), the
retainer (5), and the seal (6). A mixture (7) of an auxiliary agent for the
grease and a resin is fixed to a surface, of the seal (6) (one of the members constructing the space inside the bearing), which is disposed at a side of the space inside the bearing.