PURPOSE: To provide a bobbin for winding a rolled material, whose manufacture expense can be reduced and the manufacture period can be shortened, when a bobbin for winding which can cope with the change of either the width of a wound material or the inside diameter of the coil wound in coil shape or both of them change.

CONSTITUTION: A bobbin for winding a rolled material or the like is equipped with a bobbin body 1 which has a plurality of drum plates 5 circular in vertical cross section for forming a cylindrical drum 4 and a fixed side plate 6 provided on one side of the drum 4. A cylindrical drum 13 for winding is formed by fitting side plates 2 for adjustment of the width of a winding part with a specified thickness and a member 3 for expansion of drum diameter freely of mounting and removal on the bobbin body 1.