To prevent the generation of snap of yarn due to the knitting failure and overlap of yarns at a twill knot part by forming a yarn layer while continuously reducing the twill angle from the most inside layer of winding start to the most outside layer of winding end without having a twill knot part in the yarn layer, and setting the quantity of winding at a specified value or more.

An upper limit of the quantity of winding of an elastic bobbin- wound yarn body is not specially limited, but generally set at 450 g or more, desirably, 500 g or more so that the temporary knitting frequency at the time of working is reduced. In the case of the quantity of winding less than 450 g, temporary knitting frequency becomes too large. The elastic yarn wound body having an aligned winding shape capable of restricting the generation of snap can continuously reduce the twill angle within a constant range from the winding start, and can be wound up in the condition that the number of revolution of a traverse cam and the number of revolution of a bobbin holder are small. With this structure, a cheese, which is not formed with knitting knot and which can restrict the generation of snap due to the overlap at the time of unreeling, can be obtained.