A gas-insulated switchgear, wherein - a circuit breaker is accommodated in a circuit breaker compartment such that a contacting/separating direction of a contact of the circuit breaker is along a vertical direction, - a cable terminal of a first cable connected to one terminal (la) of the circuit breaker via a first disconnector is accommodated in a first connection compartment such that a central conductor of the cable terminal is along the vertical direction, - a cable terminal of a second cable connected to the other terminal of the circuit breaker via a second disconnector is accommodated in a second connection compartment such that a central conductor of the cable terminal is along the vertical direction, - the disconnectors are vertically disposed such that the contacting/separating direction of the contacts thereof is along the vertical direction, - insulation gas is sealed in each of the compartments, - the first connection compartment and the second connection compartment are joined to the circuit breaker compartment so as to be aligned horizontally relative to the circuit breaker compartment , characterized in that - a circuit breaker operating mechanism for switching the circuit breaker and the operating mechanisms of the disconnectors are disposed outside of the compartments , in the contacting/separating direction of the respective contacts, so that no projection is formed on an outer circumferential surface of the entirety of the compartments of the gas-insulated switchgear, wherein the first connection compartment is joined to the circuit breaker compartment on a side opposite to a side on which the second connection compartment is joined to the circuit breaker compartment , the other terminal (lb) of the circuit breaker and the cable terminal of the second cable are connected to each other via the second disconnector , and wherein the second disconnector is accommodated in the second connection compartment so as to be aligned with the cable terminal of the second cable in line such that a contacting/separating direction of a contact of the second disconnector is along the vertical direction. - a circuit breaker is accommodated in a circuit breaker compartment such that a contacting/separating direction of a contact of the circuit breaker is along a vertical direction, - a cable terminal of a first cable connected to one terminal (la) of the circuit breaker via a first disconnector is accommodated in a first connection compartment such that a central conductor of the cable terminal is along the vertical direction, - a cable terminal of a second cable connected to the other terminal of the circuit breaker via a second disconnector is accommodated in a second connection compartment such that a central conductor of the cable terminal is along the vertical direction, - the disconnectors are vertically disposed such that the contacting/separating direction of the contacts thereof is along the vertical direction, - insulation gas is sealed in each of the compartments, - the first connection compartment and the second connection compartment are joined to the circuit breaker compartment so as to be aligned horizontally relative to the circuit breaker compartment , characterized in that - a circuit breaker operating mechanism for switching the circuit breaker and the operating mechanisms of the disconnectors are disposed outside of the compartments , in the contacting/separating direction of the respective contacts, so that no projection is formed on an outer circumferential surface of the entirety of the compartments of the gas-insulated switchgear, wherein the first connection compartment is joined to the circuit breaker compartment on a side opposite to a side on which the second connection compartment is joined to the circuit breaker compartment , <EOS>