To provide a metal mask for cream solder printing capable of satisfying requirements for manufacturing a great amount of printed wiring boards in a short time at a low cost, and to provide a set frame for the metal mask.

A structure wherein the metal mask and the mask set frame can be separated is provided. The metal mask having installing holes on four sides of the metal mask and the set frame wherein a plurality of guide pins to be inserted into the installing hole are provided at specific intervals, are used. One metal mask set frame can be commonly used for a plurality of metal masks.