The present disclosure provides a sock comprising a leg portion, and an elastic band portion coupled to the leg portion, wherein the band portion is knitted using only a covering yarn, wherein a bottom of the band portion is coupled in an integrated manner to a top of the leg portion via knitting, wherein the band portion has inner and outer portions, wherein the band and leg portions are knitted with each other such that each of first loops of outer and inner yarns of the leg portion passes through and hooks on both of first and last loops of the band portion, and, thereafter, the covering yarn is cut, and, then, the leg portion is continuously knitted using the outer and inner yarns thereof.