The present invention provides: an electric wiring structure in which a connection point of electric wiring can be disposed in an interior side wall so as to enhance the convenience of electric wiringconstruction, and a power line can be disposed along the interior side wall so as to reduce electric wiring material; and a building construction method. An electric wiring structure with a connection point disposed in a side wall according to the present invention includes: a first power line drawn out from a distribution box and disposed through the inside of a first electric-wiring tube embedded in the base of a floor surface formed from a concrete material in an indoor space; a first joint box which is provided embedded at a prescribed height inside a first side wall formed in the indoorspace and is electrically connected to the first power line; a first electric light wire electrically connected to the first joint box; and a second joint box which is provided embedded at a prescribed height inside a second side wall formed in the indoor space and is electrically connected to the first joint box through a second power line disposed through the inside of a second electric-wiring tube embedded in the base of the floor surface in the indoor space.