A gas circuit breaker, comprising: a first contact portion including a first arc inducement contact; a second contact portion including a second arc inducement contact, which is formed so as to be relatively movable with respect to the first arc inducement contact so as to be in a state of being in contact with the first arc inducement contact or a state of being separated from the first arc inducement contact; a gas chamber configured to store extinguishing gas for extinguishing arc generated between the first arc inducement contact and the second arc inducement contact when the first arc inducement contact is separated from the second arc inducement contact; a gas injection nozzle formed of an electric insulating material and configured to form an injection passage of extinguishing gas; and an arc length limiting contact disposed so as to be spaced apart from the second arc inducement contact, and configured so as to be moved together with the second arc inducement contact when the second arc inducement contact moves, and configured so that an end of the arc length limiting contact at the second arc inducement contact side is located at a point beyond an end of the first arc inducement contact when the first arc inducement contact is farthest from the second arc inducement contact, wherein the gas injection nozzle is configured to be moved together with the second arc inducement contact, and the arc length limiting contact is fixed to the gas injection nozzle wherein the first arc inducement contact is formed in a rod shape, and the arc length limiting contact includes an axis-directional extended portion, being extended in the movement direction of the second arc inducement contact, provided with a through-hole, into which the first arc inducement contact is inserted wherein the axis-directional extended portion is disposed within the gas injection nozzle, characterized in that the arc length limiting contact further includes a plurality of radius-directional extended portions extended from the axis-directional extended portion in a radius direction and connected to the gas injection nozzle, and the plurality of radius-directional extended portions is spaced apart from each other so that the extinguishing gas is movable therebetween. a first contact portion including a first arc inducement contact; a second contact portion including a second arc inducement contact, which is formed so as to be relatively movable with respect to the first arc inducement contact so as to be in a state of being in contact with the first arc inducement contact or a state of being separated from the first arc inducement contact; a gas chamber configured to store extinguishing gas for extinguishing arc generated between the first arc inducement contact and the second arc inducement contact when the first arc inducement contact is separated from the second arc inducement contact; a gas injection nozzle formed of an electric insulating material and configured to form an injection passage of extinguishing gas; and an arc length limiting contact disposed so as to be spaced apart from the second arc inducement contact, and configured so as to be moved together with the second arc inducement contact when the second arc inducement contact moves, and configured so that an end of the arc length limiting contact at the second arc inducement contact side is located at a point beyond an end of the first arc inducement contact when the first arc inducement contact is farthest from the second arc inducement contact, wherein the gas injection nozzle is configured to be moved together with the second arc inducement contact, and the arc length limiting contact is fixed to the gas injection nozzle wherein the first arc inducement contact is formed in a rod shape, and the arc length limiting contact includes an axis-directional extended portion, being extended in the movement direction of the second arc inducement contact, provided with a through-hole, into which the first arc inducement contact is inserted wherein the axis-directional extended portion is disposed within the gas injection nozzle, characterized in that the arc length limiting contact further includes a plurality of radius-directional extended portions extended from the axis-directional extended portion in a radius direction and connected to the gas injection nozzle, and the plurality of radius-directional extended portions is spaced apart from each other so that the extinguishing gas is movable therebetween.