A differential signal transmission cable includes an insulated wire section including a pair of signal line conductors extending parallel to each other for transmitting a differential signal and an insulation covering the pair of signal line conductors, and a shield conductor including a band-shaped metal foil and spirally wound around the insulate wire section so as to overlap at a portion in a width direction thereof. An allowable elongation of the shield conductor as a stretchable limit in a longitudinal direction without breaking is not less than 2% at normal temperature.