The resin panel of the present invention includes a first structure 15A and a second structure 15B stacked on each other. The structures include reference surfaces that serve as the front surface and the back surface of the resin panel respectively. Each of the structures includes a plurality of protrusions 150a, 150b protruding inwardly from the reference surface. The protrusions 150a of the structure 15A face the protrusions 150b of the other structure 15B each other. Jutting portions Rb of linear shape are formed between adjacent protrusions of each of the structures. The structures 15A, 15B are joined such that apical portions of the protrusions of each structure abut one another.