In a component mounting system, a portable operation terminal is wirelessly connectable to mounting machines. The portable operation terminal includes: a processing portion which displays a screen allowing a worker to select one of the mounting machines to be connected to the portable operation terminal; and a terminal-side connection processing portion which issues a connection request to the selected mounting machine and which connects the portable operation terminal to the mounting machine upon reception of an acknowledgement from the mounting machine. The mounting machine includes: an equipment-side connection processing portion which connects the mounting machine to the portable operation terminal in response to the connection request, and a notification unit which notifies the worker of the fact that the mounting machine has been connected to the portable operation terminal, directly by at least one of sound and light.