The present invention relates to a roof box comprising a bottom member (4) including a bottom section (32 and side sections (33) extending upward from said bottom section, where said bottom member is arranged for mounting said roof box on a roof of a vehicle (28), a top member (1) that is movable in relation to said bottom member between an open and a closed position, where said top member includes a top section (30) and side sections (31) extending downward from said top section, where the top member and the bottom member in closed position form a storage space for storing objects inside the roof box. At least one of said side sections (33) of the bottom member (4) and/or the top member (1) include an outer shell (44, 1) provided with a transparent area (34). Further, the invention relates to use of an electroluminescent plate (10) as a shell with integrated light source for a roof box.