Abstract: A patient transfer device for aiding in the comfortable and easy transfer of incapacitated persons from a bed to a gurney, or vice versa. The transfer device has a stationary board having a number of roller assemblies, and a movable board having a number of channels for accommodating the roller assemblies. When the movable board is mounted on top of the stationary board, the roller assemblies allow the movable board to slide thereover. Each roller assembly has a column of balls secured within a track. Dividers extend horizontally between the side walls, adjacent to the balls, to prevent the balls from sliding within the track. The movable board channels are interlocked with the tracks. This configuration prevents the movable board from lifting upward, off of the stationary board while in use.