To provide a door guide device of a suspension type door capable of maintenance without removing the door.

This door guide device 1 has a base board 2 placed on a floor surface 70 and formed in a substantially L shape by arranging a plate part 3 for arranging a guide roller 5 for guiding the door 40 on the tip side and a vertical plate part 4 run along a base end part 31 on the rear end side, and a substantially U-shaped bracket 6 fixed to the vertical plate part 4 and engaging with a side column 30, in a corner place between its floor surface 70 and the base end part 31 of the side column 30 erected on the closing end side of the suspension type door 40 for opening and closing an opening part 60. The bracket 6 is installed on the side column 30, and can be attached-detached still in a suspending state of the door 40.