To provide a hydraulic turbine draft-pipe scaffolding capable of being rapidly installed and having a sufficient strength.

Since the hydraulic turbine draft-pipe scaffolding mounted in the case of the assembly of a draft pipe for hydraulic machinery, the case of its disassembly, the case of its inspection or the like has an insertion susceptor 1 composed of a scaffolding-base insertion guide 2 with an insertion- susceptor 1 mounting plate set up through the manhole-cover clamping boltholes of the flange of the draft pipe and rollers for inserting scaffolding base 3, the scaffolding base 3 with scaffolding-base holding beams 5 functioning as rails corresponding to the rollers of the insertion susceptor 1 and being opened after inserting into the draft pipe and a scaffolding plate 6 capable of being inserted from a narrow hole in a cylindrical vertical type pipe and being extended in the draft pipe on the scaffolding base 3, all insertion installation works of the scaffolding can be conducted outside a draft by mounting an open-close operating mechanism outside the draft pipe, and operation can be conducted rapidly and safely.