Provided is a flexible printed wiring board capable of increasing the number of wires even when the board is used in a narrow arrangement space and enhancing the degree of freedom for design while maintaining the board in a self-supported state. A flexible printed wiring board 100 is used in a state, in which one and another ends in a longitudinal direction are fixed respectively to one and another members that move in relation to each other in a state of being bent to be curved in the longitudinal direction. The flexible printed wiring board includes wiring board units 100A and 100B in which a plurality of wires are formed on a flexible insulating substrate and which are molded in a state of being curved in a lateral direction, and adjacent wiring board units are partially connected at side edges thereof in the lateral direction.