PURPOSE: To simply and accurately construct a foundation by a method in which a hollow asbestos slate form of a convex cross section is buried in a foundation pit, an anchor bolt is pierced through and fixed to the upper through hole of the form, and then concrete is placed into the hollow of the form.

CONSTITUTION: A hollow asbestos slate form 1 having a convex cross section, a partly opened upside 1a, and an edge 3 extending from the upside end 1b and having through holes 2 provided in place in set in a foundation pit 4, and an anchor bolt 5 is pierced through and fixed to the through holes 2. Concrete 8 is placed into the hollow 7 of the asbestos slate form 1 and cured for hardening.