PROBLEM TO BE SOLVED: To provide a more inexpensive and easily utilizable jig as a jig for use in formation of a space between a form for upper foundation construction and a lower foundation.SOLUTION: A jig for foundation work includes two sill members 12 and 13 that are placed on a lower foundation 3 in the state of having a clearance W provided therebetween, and a support member 11 that is placed on each of the two sill members 12 and 13 in a position astride the clearance W to support a bottom plate 4 of a form for construction of an upper foundation 2. The state of making the support member 11 support the bottom plate 4 is released by widening the clearance W to drop the support member 11 into the clearance W after the construction of the upper foundation 2.
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