BASE UNIT FOR UNDER FLOOR WIRING

PROBLEM TO BE SOLVED: To solve a problem that a part of electric wiring laid in a space defined by laying a floor unit having support legs furnished at four corners of a square roof is crushed by the support legs of the floor material unit. SOLUTION: A base unit 1 is laid to be used under a floor material unit 10 having support legs at four corners laid on a floor substrate, and the base unit 1 is cut off crisscross in its corner parts in order for the support legs 12 of the floor material unit 10 to pass therethrough; subsequently there is provided raised parts 4 so as to prevent electric wires to be installed at least on the surface of the exterior part of the base unit 1 positioned between the support legs 12, 12 of the floor material unit 10 from being laterally mounted toward the support legs 12 side of the floor material unit 10. In this structure, formation is done such that a part of electric wires laid on the base unit 1 is avoided from running out laterally, as a result, the wires are not squashed by support legs 12 during the laying operation of the floor material unit 10.