A power supply apparatus for a vehicle slide door, including a cable installed between a vehicle body and a slide door and a cable guide for guiding the cable. The cable guide includes a plurality of link members interconnected into a linear configuration. The cable guide includes a first section and a second section. The first section is capable of being bent in a predetermined direction from a generally linear condition. The second section is capable of being bent in an opposite direction opposite to the predetermined direction from a generally linear condition.