The object of the present invention is to provide a compound bearing apparatus having arrangements for preventing the lubricant present around the rotating bodies from leaking out to the outside as well as the interior space between two rows of rotating bodies of the bearing apparatus. This is effected for the purpose of providing the compound bearing apparatus and a spindle motor and a swing arm assembly for a hard disk drive device including such bearing apparatus in which the sufficient amount of lubricant can be retained around the rotating bodies to obtain long life feature and having substantially no noise or vibration due to the loss of lubricant. The compound bearing apparatus in accordance with the present invention includes a stepped shaft 1 having enlarged diameter shaft portion 1a and reduced diameter shaft portion 1b, a sleeve outer race 2 surrounding the stepped shaft, two rows of rotating bodies 3, 4 interposed therebetween, outer sealing plates 10, 11 provided on the outer side of each rotating bodies respectively, and inner sealing plates 13, 14 provided on the inner side of each rotating bodies respectively.