A switch comprising: a first fixed contact and a second fixed contact fixed in a container in which an insulating gas is filled; and a first movable contact and a second movable contact both provided to be reciprocatingly movable with respect to the fixed contacts (3, 5), the first movable contact configured to come into contact with and separate from the first fixed contact and the second movable contact configured to come into contact with and separate from the second fixed contact, wherein the switch further comprises a pin provided in the container and configured to move along an arcuate track, a first groove and a second groove in which the pin is fit and is movable are formed in the movable contacts (4, 6), the pin is fit in the first groove, which is the groove (12, 14) formed in the first movable contact, and the second groove, which is the groove (12, 14) formed in the second movable contact, the grooves (12, 14) include first and second linear grooves (12a, 14a) linearly extending substantially perpendicularly to a moving direction of the movable contacts (4, 6) and substantially in parallel to a plane including the moving track of the pin and first and second arcuate grooves (12b, 14b) that communicates with the linear grooves (12, 14a) and overlaps the moving track of the pin, characterized in that: when the pin moves on the arcuate track, the pin passes the second linear groove, which forms the second groove, while passing the first arcuate groove, which forms the first groove, and passes the first linear groove, which forms the first groove, while passing the second arcuate groove, which forms the second groove, the pin moves in the linear grooves (12a, 14a), whereby the movable contacts (4, 6) reciprocatingly move. a first fixed contact and a second fixed contact fixed in a container in which an insulating gas is filled; and a first movable contact and a second movable contact both provided to be reciprocatingly movable with respect to the fixed contacts (3, 5), the first movable contact configured to come into contact with and separate from the first fixed contact and the second movable contact configured to come into contact with and separate from the second fixed contact, wherein the switch further comprises a pin provided in the container and configured to move along an arcuate track, a first groove and a second groove in which the pin is fit and is movable are formed in the movable contacts (4, 6), the pin is fit in the first groove, which is the groove (12, 14) formed in the first movable contact, and the second groove, which is the groove (12, 14) formed in the second movable contact, the grooves (12, 14) include first and second linear grooves (12a, 14a) linearly extending substantially perpendicularly to a moving direction of the movable contacts (4, 6) and substantially in parallel to a plane including the moving track of the pin and first and second arcuate grooves (12b, 14b) that communicates with the linear grooves (12, 14a) and overlaps the moving track of the pin, characterized in that: when the pin moves on the arcuate track, the pin passes the second linear groove, which forms the second groove, while passing the first arcuate groove, which forms the first groove, and passes the first linear groove, which forms the first groove, while passing the second arcuate groove, which forms the second groove, the pin moves in the linear grooves (12a, 14a), whereby the movable contacts (4, 6) reciprocatingly move. when the pin moves on the arcuate track, the pin passes the second linear groove, which forms the second groove, while passing the first arcuate groove, which forms the first groove, and passes the first linear groove, which forms the first groove, while passing the second arcuate groove, which forms the second groove, the pin moves in the linear grooves (12a, 14a), whereby the movable contacts (4, 6) reciprocatingly move.