A hydrodynamic bearing device which can improve reliability by stabilizing a balance of dynamic pressures generated at a thrust bearing portion. The spindle motor 1 includes a hydrodynamic bearing device 4 including a shaft 41, a sleeve 42, first and second thrust flanges 41b and 41c, first and second thrust bearing portions 72 and 73 and thrust dynamic pressure generating grooves 72a and 73a. The thrust dynamic pressure generating grooves 72a and 73a are formed such that a plurality of groove portions are connected without being isolated from each other, and the groove depth becomes greater from the inner periphery toward the outer periphery.