To improve the cutting accuracy of a sketch material and also shorten a tact time.

First and second shearing machines 1, 3 in which the cutting direction is arranged in the orthogonally crossing direction mutually have the first and second original point positioning devices 13, 15 of a work W and a holding device turnable on a plane while holding the work W on the tip of a C frame and also first and second manipulators 17, 19 having the work W approachable to and separable from the shearing edge. The work W is carried from the first shearing machine 1 to the second shearing machine 3 by a work carrying means 21. As the same basic surface BL of the work W is positioned by the first/second original point positioning device 13, 15, the right angle degree of the orthogonally crossing side and four sides of the work W is sheared accurately. Simultaneously with the carrying out of the cut work W, the work W to be cut next is carried in the bosoms of the first/second manipulators 17, 19 and the work W is carried in and out simultaneously.