A sunroof device is made up of a pair of guide rails placed at laterally opposed inner peripheries of an open area of a vehicle. The pair of guide rails support a movable panel covering and uncovering the open area. A first gutter portion extends along a lengthwise direction of the guide rail. A second gutter portion is positioned below the first gutter portion and is brought into fluid communication with an end of the first gutter portion, characterized in that the second gutter portion is formed with an upstanding wall located at a distance from the end of the first gutter portion when the second gutter portion is brought into an overlap condition in such a manner that the upstanding wall defines an area of the second gutter portion to be overlapped with the first gutter portion. An easy connection can be made between the first gutter portion and the second gutter portion.