The present invention provides an insulated cable (1) with which it is possible to suppress cable fatigue even when the cable is routed in an automatic transmission (AT) or a continuously variable transmission (CVT) and shaken by an AT fluid or a CVT fluid. The insulated cable (1) has a conductor (2) and an insulator (3) that covers the outer circumference of the conductor (2). The cross-sectionalarea of the conductor (2) is 0.4 mm2 or less. The insulator (3) includes a polymer having S or F in the main chain, and has a thickness of 0.05 mm or greater. The cable density of the insulated cable(1) is 3.1 g/cm3 or greater. The density of the insulator (3) is preferably 1.5 g/cm3 or greater.