To provide a temporary scaffolding device for checking a slant wall surface of a ship bottom which is unnecessary for a worker to hold a ladder stretched over the slant wall surface of the ship bottom, and capable of holding and fixing the ladder to a predetermined position.

The temporary scaffolding device comprises a base frame 1 having a plurality of attraction bodies formed of a permanent magnet and a clamp for fixing a single tube on a frame body 2, a ladder receiving beam 7, a short ladder 11 having a locking hook on its lower end with a single tube for connection being horizontally stretched over its upper end, and a long ladder 12 having a locking hook on its lower end. The base frame 1 is attracted and fixed onto a ship bottom floor surface 20 close to a lower end of a slant wall surface 30 by the attraction bodies. A lower side horizontal single tube of the ladder receiving beam 7 is fixed to the base frame 1 by a clamp 5 for fixing the single tube. A lower side locking hook 18 of the ladder 12 is locked to an upper side horizontal single tube of the ladder receiving beam 7, and the entire ladder 12 is spliced to the slant wall surface 30.

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