A spindle motor (80) is composed of a sleeve (5), a shaft (1) that is rotatably sustained by the sleeve (5) in a radial direction through a dynamic pressure bearing (20) containing lubricant (12), and a hub (3) that is fixed to the shaft (1). The hub (3) has a raised section (11) in a ring shape that surrounds one end portion of the sleeve (3). The spindle motor (80) is provided with a taper seal section (14) for the lubricant (12) between an outer circumferential surface (10) of the one end portion of the sleeve (5) and an inner circumferential surface (13) of the raised section (11), which confronts the outer circumferential surface (10) of the sleeve (5), wherein a gap between these surfaces (10, 13) increases in accordance with a distance from the one end portion of the sleeve (5), and formed with a reservoir (25) for the lubricant (12) between an end surface (5d) of the one end portion of the sleeve (5) and a surface (3d) of the hub (3) that confronts the end surface (5d), wherein the end surface (5d) is in parallel with the surface (3d) with maintaining a prescribed gap (g) between them.