There is provided a double-skin structure in which it is possible to obtain an aesthetic improvement in addition to restricting an increase in the number of manufacturing steps. The structure includes a connection portion connecting together an end portion of a first projection portion of a first mold member and an end portion of a second projection portion of a second mold member; a cover plate that is provided between the first mold member and the second mold member, and that blocks an upper end side of a recessed portion bounded by a first rib, a second rib, the first projection portion, and the second projection portion; and a bonding portion that bonds the cover plate to the first mold member, and the cover plate to the second mold member.