Abstract: A spindle motor includes a hydrodynamic gas radial bearing in which an inner ring, which is a radial shaft member, fixed to a bracket, and an outer ring, which is a radial bearing member, fixed to a housing are opposed to each other in a radial direction of the housing; and a hydrodynamic gas thrust bearing having a thrust bearing surface, which is a thrust shaft member, located on an upper surface of the inner ring and a thrust plate, which is a thrust bearing member, fixed to the housing are opposed to each other in the axial direction of the housing, wherein opposing surfaces of the thrust bearing surface and the thrust plate of the hydrodynamic gas thrust bearing are located within a bearing-functional-dimension region L of the hydrodynamic gas radial bearing.