The two-sides in-mold decoration molding die includes a first mold on which the first decoration film is lengthwise movably disposed, and a second mold on which the second decoration film is laterally movably disposed and provided with a sprue and a runner, and a protruding section set higher than a region where the second decoration film passes is provided in a portion surrounding at least the runner, in an area directly confronting the first decoration film when the molds are clamped.