A contact lens for correction of irregular astigmatism, which is adapted to correct asymmetrical power difference due to irregular astigmatism caused by a conical cornea, comprising: a positioning mechanism provided for specifying a circumferential rest position of the contact lens in a worn state; a positive correction area for correction of irregular astigmatism caused by the conical cornea using a positive lens power on an upper side of a horizontal direction line that is orthogonal to a special radial line extending in a vertical direction at the circumferential rest position specified by the positioning mechanism; and a negative correction area for correction of irregular astigmatism caused by the conical cornea using a negative lens power on a lower side of the horizontal direction line, wherein with the positive correction area, the positive lens power is set so as to gradually become larger from an outer peripheral edge part toward a central portion of the positive correction area, and with the negative correction area, the negative lens power is set so as to gradually become smaller from an outer peripheral edge part toward a central portion of the negative correction area wherein the special radial line extends in a vertical direction at the circumferential rest position of the contact lens specified by the positioning mechanism, the contact lens being characterized in that either of the positive correction area or the negative correction area expands from one of the top or the bottom sides to the other of the bottom or the top sides beyond the lens center, relative sizes of the positive correction area and the negative correction area differ, and the area more to the top side than a horizontal line sandwiched between both correction areas (27, 28) is used as the positive correction area and the area more to the bottom side than said line is used as the negative correction area. a positioning mechanism provided for specifying a circumferential rest position of the contact lens in a worn state; a positive correction area for correction of irregular astigmatism caused by the conical cornea using a positive lens power on an upper side of a horizontal direction line that is orthogonal to a special radial line extending in a vertical direction at the circumferential rest position specified by the positioning mechanism; and a negative correction area for correction of irregular astigmatism caused by the conical cornea using a negative lens power on a lower side of the horizontal direction line, wherein with the positive correction area, the positive lens power is set so as to gradually become larger from an outer peripheral edge part toward a central portion of the positive correction area, and with the negative correction area, the negative lens power is set so as to gradually become smaller from an outer peripheral edge part toward a central portion of the negative correction area wherein the special radial line extends in a vertical direction at the circumferential rest position of the contact lens specified by the positioning mechanism, the contact lens being characterized in that either of the positive correction area or the negative correction area expands from one of the top or the bottom sides to the other of the bottom or the top sides beyond the lens center, relative sizes of the positive correction area and the negative correction area differ, and the area more to the top side than a horizontal line sandwiched between both correction areas (27, 28) is used as the positive correction area and the area more to the bottom side than said line is used as the negative correction area.