To provide a rolling bearing capable of reliably preventing a foreign matter from entering the interior of a bearing until starting the use of the rolling bearing.

A deep groove ball bearing 10 (rolling bearing) includes an inner ring 12, an outer ring 11 and sealing devices 30 which seal annular spaces between the inner ring 12 and the outer ring 11, wherein each of the sealing devices 30 has an annular seal member 15 which is fit in and attached to the circumferential surface in the axial direction end part on an raceway side, of the outer circumference of the outer ring 11, which is extended toward the axial direction end part of the inner ring 12 and forms a labyrinth gap 17 between the tip part of the extension side and the outer circumference near the axial direction end part of the inner ring 12. In the deep groove ball bearing 10, the seal member 15 includes an extension part 15b which is extended toward the inner ring 12 direction and the axial direction outer side from the vicinity of the tip on inner ring 12 side, the sealing device 30 has an annular pressure-sensitive adhesive 18 which adheres the vicinity of the radial direction tip and the axial direction inner side of the extension part 15b, and the outer circumference from the line from which the vertex of the axial direction end part of an raceway side outer circumference of the inner ring 12 becomes annular to the lateral surface and, upon relative rotation of the deep groove ball bearing 10, the pressure-sensitive adhesive between the seal member 15 and the inner ring is changed to a repellent state from a sticky state to form the labyrinth gap.