PURPOSE: To eliminate the generation of a crossover or a stranded wire unevenness by compression molding a flat stranded wire immediately after stranding into a flat type molded stranded wire at first, and after that, compression molding into a molded stranded wire with a keystone angle.

CONSTITUTION: After superconducting bare wires 11 are stranded into a flat form, they are compression molded by four-way rolling rolls 31a to 31d for flat type molding. Then, they are compression molded by four-way rolling rolls 33a to 33d for giving a keystone angle so as to manufacture a superconducting molded stranded wire with a keystone angle. By making the molded formation at the first rolling into a flat form without a keystone angle, the superconducting stranded wires 11 are contacted evenly with the rollers 31a to 31d when the flat stranded wires immediately after the stranding are compressedly molded, and an even compression molding can be carried out. Consequently, a superconducting molded stranded wire with keystone angle having no defects such as a crossover and a stranding unevenness, and having a high rigidity, can stably be manufactured.