A flexible wiring member capable of electrically connecting a plurality of desired points separated in a length direction, the flexible wiring member comprising: a first and second conductor holding layers (11, 12) that are formed in a state of being stacked in a thickness direction and being electrically insulated from one another, wherein the first and second conductor holding layers (11, 12) are formed by an insulating resin; a power supply line conductor that has a wide width and is disposed in the first conductor holding layer and a power supply line conductor that has a wide width and is disposed in the second conductor holding layer that is adjacent to the first conductor holding layer in the thickness direction, wherein the second conductor holding layer directly covers the power supply line conductor; characterized in that the power supply line conductor, disposed in the first conductor holding layer is a power supply ground line conductor; a plurality of communication line conductors (14, 15) that have a width smaller than that of the power supply ground line conductors are disposed in the first conductor holding layer, the first conductor holding layer directly covers the power supply ground line conductor, and the communication line conductors (14, 15), the power supply line conductor, disposed in the second conductor holding layer has a width wider than the width of the power supply ground line conductor, disposed in the first conductor holding layer, and a width obtained by adding the width of the power supply ground line, the width of the plurality of communication line conductors (14, 15) and the width of portions of the first conductor holding layer disposed between the conductors (22, 14, 15) matches the width of the power supply line conductor disposed in the second conductor holding layer. a first and second conductor holding layers (11, 12) that are formed in a state of being stacked in a thickness direction and being electrically insulated from one another, wherein the first and second conductor holding layers (11, 12) are formed by an insulating resin; a power supply line conductor that has a wide width and is disposed in the first conductor holding layer and a power supply line conductor that has a wide width and is disposed in the second conductor holding layer that is adjacent to the first conductor holding layer in the thickness direction, wherein the second conductor holding layer directly covers the power supply line conductor; characterized in that the power supply line conductor, disposed in the first conductor holding layer is a power supply ground line conductor; a plurality of communication line conductors (14, 15) that have a width smaller than that of the power supply ground line conductors are disposed in the first conductor holding layer, the first conductor holding layer directly covers the power supply ground line conductor, and the communication line conductors (14, 15), the power supply line conductor, disposed in the second conductor holding layer has a width wider than the width of the power supply ground line conductor, disposed in the first conductor holding layer, and a width obtained by adding the width of the power supply ground line, the width of the plurality of communication line conductors (14, 15) and the width of portions of the first conductor holding layer disposed between the conductors (22, 14, 15) matches the width of the power supply line conductor disposed in the second conductor holding layer.