PURPOSE: To easily mount and remove a sunshade device with simple constitution to and from the lighting skylight in a vehicle, by providing stopper parts to the lower surface of its lighting plate and removably mounting a light-nonpermeable plate below a light permeable plate through said stopper parts.

CONSTITUTION: To a skylight for lighting spread with a light permeable plate 3 in an opening part 2 partially provided in a vehicle roof 1, a sunshade device consisting of a light-nonpermeable plate 4 is mounted by overlapping below the light permeable plate 3, and a fixed hook 5 and movable hook 6 are provided in oppositely facing two sides of the light-nonpermeable plate 4, then the movable hook 6 is normally urged to the protruding direction by action of a spring 7. While stopper parts 9, 10 for the above described hooks 5, 6 are provided in an internal peripheral edge of a reinforcing frame 8 mounted to the periphery of the light permeable plate 3, and covered by a protective cover 11 made of synthetic resin. When the light-nonpermeable plate 4 is removed from an illustrated mounting state, a finger hooking part 61 of the movable hook 6 is hooked by finger to move the hook 6 backward against the spring 7, disengage the hook from the stopper part 10 and remove the plate 4.