Abstract: An object of the present invention is to provide a method of manufacturing a fluid dynamic bearing device and a bearing part for a thrust bearing, both of which are applied to a flat and thin bearing part and are capable of preventing abrasion and scratching even if two parts make contact with each other. A fluid dynamic bearing mechanism 40 includes a shaft 1 functioning as an axis of rotational, a sleeve, a flange 3, a thrust plate 4, and a thrust bearing portion 22. The sleeve is disposed on the outer peripheral side of the shaft. The flange is disposed in the vicinity of the end portion of the shaft, and includes a bottom surface 3c perpendicular to a central axis direction of the shaft. A thrust receiver includes a front surface 4a opposed to the bottom surface. The thrust bearing portion is formed between the bottom surface and the front surface, and includes a plurality of thrust dynamic generation grooves 3a formed on the bottom surface.