PURPOSE: To drain rain water invading between the front edge of the opening part of a roof panel and the front end of a slide panel.

CONSTITUTION: A slide panel 3 is arranged on the opening part provided on the roof panel 1 of a vehicle body. Guide rails 4,4 are arranged on both sides of the opening part 2 of the roof panel 1 along the front and rear direction of the body. A tilt mechanism 5 to upward move the rear end of the slide panel 3 is provided between the guide rail 4 and the slide panel 3. A front drain 6 is provided in the direction of crossing with the guide rail 4 on the lower part of the front end of the slide panel 3. By blockading the opening part 2 of the roof panel 1 with the slide panel 3, the front drain 6 is positioned facing to the vicinity of the lower part of the front edge of the opening part 2 of the roof panel 1. When rain water is passed to invade between the front edge of the opening part 2 of the roof panel and the front end of the slide panel 3, the rain water is drained to the rain gutter of the guide rail 4 through the front drain 6.