The present invention provides a method for producing a mold made of a composite material by using a prepreg material. First, a material 200 of a mold having a long two-dimensional shape and in a semi-cured state is produced from a prepreg sheet by continuous pultrusion molding. Subsequently, the semi-cured material 200 is mounted on a plurality of templates 131, 132, 133, 134, and 135 vertically provided on a base plate 120 of a molding apparatus 100, and thereby plastically deformed into a three-dimensional shape. The entire molding apparatus 100 is heated and pressurized to produce a completely-cured mold.