A work apparatus for a production line configured from multiple electronic component mounters lined up in a row in a conveyance direction of a circuit board, the work apparatus being configured to perform specified work with respect to each of the multiple electronic component mounters, the work apparatus comprising: an exchanging device configured to perform collecting and supplying of an exchange element configured to be set on each of the multiple component mounters; wherein the exchange element is a feeder configured to supply electronic components to be mounted on the circuit board, and the exchanging device is configured to perform collecting and supplying of the feeders between each of the multiple electronic component mounters, a first rail provided on a front section of the multiple electronic component mounters, extending in the conveyance direction of the circuit board, and including a planar traveling path; characterized by a moving device configured to move the exchanging device along the first rail by driving a driving wheel configured to engage with the traveling path of the first rail via friction, wherein provided on each of the multiple electronic component mounters are upper section slots configured to support the set feeder such that operation is possible, and lower section slots provided below the upper section slots and configured to stock the set feeder, the first rail is provided on each of the multiple electronic component mounters between the upper section slots and the lower section slots in the vertical direction, the exchanging device includes an upper section transfer section configured to transfer the feeder being exchanged between the upper section slots, and a lower section transfer section configured to transfer the feeder being exchanged between the lower section slots, and the driving wheel is provided between the upper section transfer section and the lower section transfer section in the vertical direction. an exchanging device configured to perform collecting and supplying of an exchange element configured to be set on each of the multiple component mounters; wherein the exchange element is a feeder configured to supply electronic components to be mounted on the circuit board, and the exchanging device is configured to perform collecting and supplying of the feeders between each of the multiple electronic component mounters, a first rail provided on a front section of the multiple electronic component mounters, extending in the conveyance direction of the circuit board, and including a planar traveling path; characterized by a moving device configured to move the exchanging device along the first rail by driving a driving wheel configured to engage with the traveling path of the first rail via friction, wherein provided on each of the multiple electronic component mounters are upper section slots configured to support the set feeder such that operation is possible, and lower section slots provided below the upper section slots and configured to stock the set feeder, upper section slots configured to support the set feeder such that operation is possible, and lower section slots provided below the upper section slots and configured to stock the set feeder, the first rail is provided on each of the multiple electronic component mounters between the upper section slots and the lower section slots in the vertical direction, the exchanging device includes an upper section transfer section configured to transfer the feeder being exchanged between the upper section slots, and a lower section transfer section configured to transfer the feeder being exchanged between the lower section slots, and an upper section transfer section configured to transfer the feeder being exchanged between the upper section slots, and a lower section transfer section configured to transfer the feeder being exchanged between the lower section slots, and the driving wheel is provided between the upper section transfer section and the lower section transfer section in the vertical direction.