To stack sole plates straightly so that the stack is not inclined when the sole plates, in which marks are projected on the top face sides, are superposed in a multistage shape.

In the sole plate 1 supporting the base fitting 4 of a jack installed at the lower end section of the scaffold support, specified marks 6 such as a company name, a trade name, a registered trademark, etc., are formed at the required places of the top face of a sole plate body 2 in a projecting surface shape. Indented sections 10, into which the forming regions 7 of the projecting surface-shaped marks 6 are sunk when the sole plates 1 are superposed, are formed to the underside of the sole plate body 2.