This building includes a power supply coil of a contactless power supply system using magnetic resonance type. Then, a construction method for this building includes steps of: linking a plurality of building members to each other respectively provided with split wires into which a power supply coil forming a loop as a whole is split at a plurality of locations along an extending direction of the power supply coil, so as to surround an indoor space; and forming the power supply coil surrounding the indoor space by electrically connecting the respective split wires to each other.