To provide an information wiring system capable of saving wiring by transmitting an information signal and DC power using a single wiring and being used in an existing apparatus.

The information wiring system includes: a coaxial cable L1 for transmitting a television signal wired into a building; an information wiring tool 3A connected to the coaxial cable L1; and a DC power superimposing section 23 for superimposing DC power on the information wiring tool 3A by superimposing the DC power on the coaxial cable L1. The information wiring tool 3A includes: a connection terminal 31 for allowing the coaxial cable L1 to be connected thereto; an information/power separating section 32 for separating the television signal and the DC power from a signal transmitted via the coaxial cable L1 and outputting them; a DC outlet 33 for outputting the DC power separated DC power by the information/power separating section 32 to the outside; and a coaxial connector connecting portion 34 for outputting the television signal separated by the information/power separating section 32 to an external video apparatus.