An electronic component mounter where information indicating completion of component mounting is memorized each time a component is mounted on circuit board by suction nozzle. Then, in a case in which mounting work is interrupted by a stoppage of the electronic component mounter and then restarted, the mounting position of the electronic component is imaged by mark camera according to information memorized immediately before the mounting work was interrupted. Also, with the electronic component mounter, in a case in which mounting work is interrupted by a stoppage of the mounter and then restarted, the mark camera is moved along a path over which the suction nozzle moved until the position of the suction nozzle when mounting work was interrupted. Here, imaging of the circuit board is performed by the mark camera.