A gas wiping device characterized by comprising: a first gas wiping nozzle and a second gas wiping nozzle arranged to face each other across a steel band pulled up from a molten-metal plating bath, the first and second gas wiping nozzles (26a, 26b) capable of removing excess molten metal adhering on a surface of the steel band; a first tubular member disposed along a width direction of the steel band, the first tubular member connected to the first gas wiping nozzle; a second tubular member disposed along a width direction of the steel band, the second tubular member connected to the second gas wiping nozzle; a box-shaped body housing the first and second gas wiping nozzles (26a, 26b), and the first and second tubular members (25a, 25b), wherein the box-shaped body has a width whose width direction is the same as a width direction of the steel band; a first partition member having one end thereof fixed to an outer wall of the first tubular member, and having the other end thereof fixed to an inner wall of the box-shaped body so that the first partition member seals a gap between the outer wall of the first tubular member and the inner wall of the box-shaped body; and a second partition member having one end thereof fixed to an outer wall of the second tubular member, and having the other end thereof fixed to an inner wall of the box-shaped body so that the second partition member seals a gap between the outer wall of the second tubular member and the inner wall of the box-shaped body, wherein the first gas wiping nozzle includes a first spraying segment (26a 1) capable of spraying gas over a range as a whole in a width direction of the steel band, a second spraying segment (26a 2) capable of spraying gas toward the second gas wiping nozzle over a range from one end of the first spraying segment (26a 1) to one inner wall of the box-shaped body in a width direction of the box-shaped body, and a third spraying segment (26a 3) capable of spraying gas toward the second gas wiping nozzle _over a range from the other end of the first spraying segment (26a 1) to the other inner wall of the box-shaped body in a width direction of the box-shaped body, and wherein the second gas wiping nozzle includes a fourth spraying segment (26b 1) capable of spraying gas over a range as a whole in a width direction of the steel band, a fifth spraying segment (26b 2) capable of spraying gas toward the first gas wiping nozzle, from over a range from one end of the fourth spraying segment (26b 1) to one inner wall of the box-shaped body in a width direction of the box-shaped body, and a sixth spraying segment (26b 3) capable of spraying gas toward the first gas wiping nozzle over a range from the other end of the fourth spraying segment (26b 1) to the other inner wall of the box-shaped body in a width direction of the box-shaped body. a first gas wiping nozzle and a second gas wiping nozzle arranged to face each other across a steel band pulled up from a molten-metal plating bath, the first and second gas wiping nozzles (26a, 26b) capable of removing excess molten metal adhering on a surface of the steel band; a first tubular member disposed along a width direction of the steel band, the first tubular member connected to the first gas wiping nozzle; a second tubular member disposed along a width direction of the steel band, the second tubular member connected to the second gas wiping nozzle; a box-shaped body housing the first and second gas wiping nozzles (26a, 26b), and the first and second tubular members (25a, 25b), wherein the box-shaped body has a width whose width direction is the same as a width direction of the steel band; a first partition member having one end thereof fixed to an outer wall of the first tubular member, and having the other end thereof fixed to an inner wall of the box-shaped body so that the first partition member seals a gap between the outer wall of the first tubular member and the inner wall of the box-shaped body; and a second partition member having one end thereof fixed to an outer wall of the second tubular member, and having the other end thereof fixed to an inner wall of the box-shaped body so that the second partition member seals a gap between the outer wall of the second tubular member and the inner wall of the box-shaped body, wherein the first gas wiping nozzle includes a first spraying segment (26a 1) capable of spraying gas over a range as a whole in a width direction of the steel band, a second spraying segment (26a 2) capable of spraying gas toward the second gas wiping nozzle over a range from one end of the first spraying segment (26a 1) to one inner wall of the box-shaped body in a width direction of the box-shaped body, and a third spraying segment (26a 3) capable of spraying gas toward the second gas wiping nozzle _over a range from the other end of the first spraying segment (26a 1) to the other inner wall of the box-shaped body in a width direction of the box-shaped body, and wherein the second gas wiping nozzle includes a fourth spraying segment (26b 1) capable of spraying gas over a range as a whole in a width direction of the steel band, a fifth spraying segment (26b 2) capable of spraying gas toward the first gas wiping nozzle, from over a range from one end of the fourth spraying segment (26b 1) to one inner wall of the box-shaped body in a width direction of the box-shaped body, and a sixth spraying segment (26b 3) capable of spraying gas toward the first gas wiping nozzle over a range from the other end of the fourth spraying segment (26b 1) to the other inner wall of the box-shaped body in a width direction of the box-shaped body.