A rotary head drum for a VCR using a fluid dynamic pressure bearing comprising a lower drum fixed to a base plate, a rotary shaft attached to the center of the lower drum, an upper drum fixed to a flange, a rotary head fixed to the upper drum to record and reproduce video signal in and from a magnetic tape, and a shaft housing including a guide groove, an air flowing groove having an air hole, a lubricant containing groove having a lubricant flowing hole, and a guide boss. The rotary shaft includes plurality lubricating grooves and a lubricant guide groove, so that the generation of the vibration and noise of conventional ball bearing when rotating the head drum, as a result it is possible to improve the Jitter and Wow-flutter of the video signal which effect upon the quality of the screen in recording or reproducing the video signal.