Abstract: A transmission medium includes: first and second lines #1 and #2, which are separated from each other and arranged substantially in parallel with each other; a third line #3, which is alternately entangled and wound around the first and second lines from one direction thereof so as to form a plurality of entangling portions Po to Pn in a longitudinal direction of the first and second lines, respectively; and a fourth line #4, which forms a plurality of entangling portions Po to Pn where the fourth line is alternately entangled and wound around the first and second lines from one direction thereof and a plurality of intersecting portions C1 to Cn where the fourth line intersects the third line internally of the first and second lines in the longitudinal direction of the first and second lines, respectively, wherein, the respective entangling portions of the third and fourth lines are alternately disposed in the longitudinal direction of the first and second lines, respectively, the winding direction of one of