PURPOSE: To contrive to uniformize the printed amount of soldering paste by a method wherein the length of the side of a rectangular opening, which is provided in a printing mask for printing the soldering paste on each electrode pad of the wiring pattern of a printed board, is set in proportion to the moving direction (or angle) of a squeegee.

CONSTITUTION: In the printing mask 10 concerned, a plurality of openings 10a and 10b, in which soldering paste is squeezed, are formed at positions corresponding to the respective electrode pads of the wiring pattern of a printed board. In the above-mentioned printing mask 10, the lengths of the shorter sides (b) and b' of the respective openings 10a and 10b are determined in proportion to the angles between the moving direction (a) of a squeegee and the longer sides of the openings. Concretely, the length (b) of the shorter side of the opening 10a, the longer side of which is normal to the moving direction, is made shorter than the length b' of the shorter side of the opening 10b, the longer side of which is parallel to the moving direction. The amount of soldering paste 4 printed by the opening 10a, through which the soldering paste 4 oozes much more, is made nearly equal to the amount of the soldering paste printed by the opening 10b.