To simply and easily adjust a longitudinal directional position of a door (a thickness directional position of the door) in a guide device for guiding a lower end part or an upper end part of the door such as a sliding door and a folding door along a guide rail.

In this door guide device for fitting a roller 7 with a collar supported on the outside end of a vertical support shaft 4 projecting from a door 1 to a guide rail 8, the vertical support shaft 4 is supported in a casing 3 installed in the door 1 so as to be autorotatable around the axis of the vertical support shaft 4, an eccentric shaft part 15 is projected from an eccentric position on the outside end of the vertical support shaft 4, the roller 7 with a collar is supported by this eccentric shaft part 15, a rotary operation part 20 is formed in a part projecting from at least the door 1 of the vertical support shaft 4, and a click mechanism 19 for frictionally locking autorotation of the vertical support shaft 4 with every proper angle is interposed between the casing 3 and the vertical support shaft 4.