GAS-INSULATED OPEN/CLOSE DEVICE

Provided is a gas-insulated switchgear that facilitates additional installation work and achieves reduction in working time in the case of increasing arranged boards in additional installation of open/close devices. A bus tank (3) storing a bus (7) is provided above a circuit breaker tank (2) storing a circuit breaker, the bus (7) is connected to a bus connection bushing (13) provided at a width-direction end of the bus tank (3), a tank width dimension of the bus tank (3) is smaller than a enclosure width dimension of the gas-insulated switchgear (1), and a space formed by a difference between the enclosure width dimension and the tank width dimension serves as a connection space for the bus (7) when the gas-insulated switchgear is arranged in a row.