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 (5, 17) 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 (9, 19) of the disconnectors (5, 17) are disposed outside of the compartments (2, 16, 18), 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 (5, 17) 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 (9, 19) of the disconnectors (5, 17) are disposed outside of the compartments (2, 16, 18), 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,