The air guide plate includes a plate body formed of a resin material and deformable skirt portions which are formed of the same resin material as the plate body and integrally formed on an outer periphery of the plate body. The air guide plate is arranged such that the plate body is disposed at a front of an automobile without connecting to automobile parts, thereby forming a gap between the outer periphery of the plate body and the automobile parts arranged around the plate body. The deformable skirt portions are disposed so as to be in contact with the automobile parts under flexural deformation, thereby closing the gap by the deformable skirt portions to prevent the air from leaking through the gap.