Connecting structure of resin panel and stiffener for vehicle

A connecting structure of a resin panel and a stiffener for a vehicle, including the resin panel, a resin frame attached to a circumference of the resin panel; a weather strip attached to the frame; a metallic stiffener which is provided at the vicinity of the circumference of the resin panel; wherein the frame includes an extended part which extends outside of a side of the resin panel and the weather strip and the stiffener are integrally connected such that the weather strip and the stiffener sandwich the extended part, and wherein the frame is moved against a pinching force of the weather strip and the stiffener when the resin panel is deformed by a thermal expansion/contraction.