A method for producing a molded body by press-molding, with a pair of dies (41, 42), a composite substrate made of a fiber-reinforced resin containing a thermosetting resin and reinforcing fibers, thereby forming a molded body with a three-dimensional shape, the method comprises: shaping the composite substrate with the thermosetting resin in an uncured state into the three-dimensional shape at a site different from where the pair of dies (41, 42) is located; conveying the shaped composite substrate to the pair of dies (41, 42) so as to maintain the three-dimensional shape thereof; placing the conveyed composite substrate on a molding surface of one of the pair of dies (41, 42) formed to suit the three-dimensional shape, so as to maintain the three-dimensional shape of the composite substrate; and pressing the composite substrate placed on the one of the pair of dies (41, 42) with another of the pair of dies (41, 42) while heated, thereby curing the thermosetting resin and thus forming the molded body, wherein the placing includes, in placing the composite substrate, pressing the conveyed composite substrate with the three-dimensional shape against the molding surface of the one of the pair of dies (41, 42) from a plurality of different directions, and wherein: in the shaping, the composite substrate in a sheet form is shaped into the three-dimensional shape along a surface of a shaping die such that a main sheet portion and a plurality of sub sheet portions extending from different positions of the main sheet portion in directions different from an extending direction of the main sheet portion are formed, characterized in that the conveying includes: a first removing step of removing the sub sheet portions from the shaping die so as to create gaps (C1, C2) between the sub sheet portions and the shaping die, with the main sheet portion in contact with the shaping die; and a second removing step of removing the main sheet portion from the shaping die, with the sub sheet portions removed from the shaping die. shaping the composite substrate with the thermosetting resin in an uncured state into the three-dimensional shape at a site different from where the pair of dies (41, 42) is located; conveying the shaped composite substrate to the pair of dies (41, 42) so as to maintain the three-dimensional shape thereof; placing the conveyed composite substrate on a molding surface of one of the pair of dies (41, 42) formed to suit the three-dimensional shape, so as to maintain the three-dimensional shape of the composite substrate; and pressing the composite substrate placed on the one of the pair of dies (41, 42) with another of the pair of dies (41, 42) while heated, thereby curing the thermosetting resin and thus forming the molded body, wherein the placing includes, in placing the composite substrate, pressing the conveyed composite substrate with the three-dimensional shape against the molding surface of the one of the pair of dies (41, 42) from a plurality of different directions, and wherein: in the shaping, the composite substrate in a sheet form is shaped into the three-dimensional shape along a surface of a shaping die such that a main sheet portion and a plurality of sub sheet portions extending from different positions of the main sheet portion in directions different from an extending direction of the main sheet portion are formed, characterized in that the conveying includes: a first removing step of removing the sub sheet portions from the shaping die so as to create gaps (C1, C2) between the sub sheet portions and the shaping die, with the main sheet portion in contact with the shaping die; and a second removing step of removing the main sheet portion from the shaping die, with the sub sheet portions removed from the shaping die. in the shaping, the composite substrate in a sheet form is shaped into the three-dimensional shape along a surface of a shaping die such that a main sheet portion and a plurality of sub sheet portions extending from different positions of the main sheet portion in directions different from an extending direction of the main sheet portion are formed, characterized in that the conveying includes: a first removing step of removing the sub sheet portions from the shaping die so as to create gaps (C1, C2) between the sub sheet portions and the shaping die, with the main sheet portion in contact with the shaping die; and a second removing step of removing the main sheet portion from the shaping die, with the sub sheet portions removed from the shaping die. a first removing step of removing the sub sheet portions from the shaping die so as to create gaps (C1, C2) between the sub sheet portions and the shaping die, with the main sheet portion in contact with the shaping die; and a second removing step of removing the main sheet portion from the shaping die, with the sub sheet portions removed from the shaping die.