2 an opening 3 and a thread holding portion 4 the holder body a is formed of a synthetic resin metal or the like the upper surface portion 1 is formed in an approximately disk form the side surface portion 2 is a portion formed in an approximately cylindrical form so as to extend downward from an outer circumferential edge of the upper surface portion 1 see fig1 a an attachment hole 11 through which the lower thread winding shaft 91 of the sewing machine 9 passes is formed in a radial center of the upper surface portion 1 a stripe shaped locking hole 11 a in which a fixing screw of the lower thread winding shaft 91 is inserted is formed in the attachment hole 11 the opening 3 is formed in the upper surface portion 1 see fig1 a 1b and 1c specifically the opening 3 is formed in a hollow form extending toward the radial central portion in which the attachment hole 11 is formed and the inner end of the opening 3 reaches up to a position near the attachment hole 11 see fig1 a the thread holding portion 4 is formed so as to extend from a portion on the inner side of the opening 3 located closer to the radial center toward the outer circumference of the upper surface portion 1 see fig1 a and 1b and fig2 a the distal end of the thread holding portion 4 is disposed inside the opening 3 and does not protrude outward from the outer circumference of the upper surface portion 1 the opening 3 is divided into two regions by the thread holding portion 4 and one region is referred to as a lower thread extraction region 31 and.