A feeder exchanging carriage includes a reel holder which holds a reel on which a carrier tape which stores electronic components is wound, a feeder holder which holds a tape feeder which performs a feeding operation of the carrier tape, and a base unit which is provided with a pair of front wheels and a pair of rear wheels, and a telescopic unit (a front base and a rear base) which expands and contracts an interval between the pair of front wheels and the pair of rear wheels. In a state where the feeder exchanging carriage is mounted to an electronic component mounter, the interval between the front and rear wheels is contracted by the telescopic unit, and in a state where the feeder exchanging carriage is not mounted to an electronic component mounter, the interval between the front and rear wheels is expanded by the telescopic unit.