A contact lens including an optical zone and a peripheral zone surrounding the optical zone , wherein the contact lens has a front surface and a back surface and the lens front surface is constituted by a circular shaped optical zone front surface having a designated diameter dimension and a ring shaped peripheral zone front surface having a designated radial direction width dimension, and the peripheral zone front surface is positioned surrounding the optical zone front surface , and is formed having concentric-circular inner and outer peripheral edge parts with a lens geometric center axis as the center, being characterized in that : a first thick part and a second thick part are provided on the peripheral zone at sections positioned at both left and right sides in a worn state of the contact lens such that each center-of-gravity position of both the first thick part and the second thick part is positioned below a horizontal diametrical line which passes through the lens geometric center axis in the worn state; a third thick part is provided on the peripheral zone at a section positioned between the first thick part and the second thick part in a circumferential direction and below the optical zone in the worn state; an upper thin part and a lower thin part whose thickness dimensions are smaller than thickness dimensions of the first to third thick parts are provided respectively at an upper peripheral zone positioned above the optical zone and a lower peripheral zone positioned below the optical zone and at an outer circumference side of the third thick part in the worn state; each of the first to third thick parts has a slanting shape in which the thickness dimension gradually becomes smaller from a maximum thickness position toward a periphery; there is a thickness dimension changing area that takes a valley form between the third thick part and each of the first and second thick parts so as to be between the respective maximum thickness positions; and in a vertical direction in the worn state, the maximum thickness position of the third thick part is set higher than a lower edge position in the first and second thick parts having the same thickness as the maximum thickness of the third thick part . a first thick part and a second thick part are provided on the peripheral zone at sections positioned at both left and right sides in a worn state of the contact lens such that each center-of-gravity position of both the first thick part and the second thick part is positioned below a horizontal diametrical line which passes through the lens geometric center axis in the worn state; a third thick part is provided on the peripheral zone at a section positioned between the first thick part and the second thick part in a circumferential direction and below the optical zone in the worn state; an upper thin part and a lower thin part whose thickness dimensions are smaller than thickness dimensions of the first to third thick parts are provided respectively at an upper peripheral zone positioned above the optical zone and a lower peripheral zone positioned below the optical zone and at an outer circumference side of the third thick part in the worn state; each of the first to third thick parts has a slanting shape in which the thickness dimension gradually becomes smaller from a maximum thickness position toward a periphery; there is a thickness dimension changing area that takes a valley form between the third thick part and each of the first and second thick parts so as to be between the respective maximum thickness positions; and in a vertical direction in the worn state, the maximum thickness position of the third thick part is set higher than a lower edge position in the first and second thick parts having the same thickness as the maximum thickness of the third thick part . <EOS>