To provide a hanging seat for high/low altitude works capable of allowing a worker to perform his work without anxiety stably without any swing when performing works at a high place or a low place.

The hanging seat α1 for high/low altitude works comprises a lower supporting member 2 which is expanded in a cantilever manner forward of a lower end of a back pillar 1 with a seat part 21 for a seated person mounted thereon, an upper supporting member 3 which is expanded in a cantilever manner forward of, parallel to and facing the lower supporting member 2 in a hanging manner by another hanging device β separately prepared on an upper end of the back pillar 1, and a curved fall-preventive handrail 4 in which safety belts 41 to prevent falls expanded in a cantilever manner forward of both sides between the lower supporting member 2 and the upper supporting member 3 of the back pillar 1 to hold both sides of an upper half body of the seated person are attachably/detachably and continuously provided at one end between seat releasing tips. A characteristic configuration means is employed, in which the lower supporting member 2, the upper supporting member 3 and the fall preventive handrail 4 are protruded in an E-shaped manner in side view in the same direction forward of the back pillar 1 with respect to the back pillar 1.