PURPOSE: To form a lubricating film uniform in thickness by guiding a lubricating liquid to a guide member from a disk hanger or the like.

CONSTITUTION: The disk hanger 9 hanged nine piece of the disk 2 is dipped into the lubricating liquid 5 and is taken up. At this time, the liquid 5 flows smoothly along the disk hanging member 8 and is guided by the guide member 6a so that the droplet of the liquid 5 does not drop to the liquid 5 from the member 8 at the time of taking up. After taking up is finished, the droplet does not have influence upon the thickness of the lubricating agent on the surface of the disk 2 with ripple by falling down of the droplet, as the member 6a is longer than radial of the disk 2 and the liquid flows in the member 6a. In this way, the lubricating film uniform in thickness is formed on the surface of the disk 2.