To provide a compact gas-insulated switchgear which attains reduction of a main shell portion holding a disconnecting portion, by improving arrangement of a lead portion of operating shafts.

The operating shafts 13, 13a are led into a projection circle of an inner diameter d of a branch portion 2b of a tank 2, having a predetermined angle to an axis of a busbar conductor 18. The operating shafts 13, 13a are led into the projection circle of the diameter d of the branch portion 2b holding the main busbar conductor 18, by which a movable contactor 9 and a movable side contact portion 3 having the movable contactor 9 are arranged in a space of the projection circle of the diameter d of the branch portion 2b, wherein the movable contactor is fitted through insulating rods 11, 11a, a pinion shaft 17, a pinion 7, and a rack 6 to the operating shafts 13, 13a.