A rolling bearing includes, at an end of a sealing member body (8), a sealing lip portion (9) having a radial edge (9a) that is brought into radial contact with an inner ring (1). The sealing lip portion (9) has a fishhook-shaped cross-section in which the sealing lip portion (9) is bent at a waist portion (11) that is an intermediate portion thereof in a radial direction, so as to form a relief recess (13) in a surface on an outer side relative to a bearing space and an extensive portion (9b) extends, in a turned back manner, from the radial edge (9a) so as to be inclined relative to an axial direction toward the outer side of the bearing. The sealing lip portion (9) includes a projection (12) that has a tapered shape in which a portion that is closer to a tip end side than the waist portion (11) has a dimension reduced toward a tip end side, and a thickness (t1) of the waist portion (11) is set so as to be not smaller than 25% of a thickness (t2) of the tip end of the sealing member body (8), and not greater than 75% thereof.