A remote-controlled mobile inspecting and monitoring system comprising a rail laid along an inspection route; power lines provided along the rail; an inspection vehicle carrying inspecting and monitoring equipments and adapted to move along the rail; and a power receiving unit mounted on the inspection vehicle so as to be connected to the power lines, wherein the inspection vehicle carries a battery unit for supplying power to the onboard equipments and a changeover unit for controlling the power receiving unit so as to be connected to or disconnected from the power lines and for opening or closing a power supply circuit for supplying power from the battery unit to the onboard equipments. The changeover unit is capable of selectively connecting either the battery unit or the power receiving unit to the onboard equipments. Thus, the remote-controlled mobile inspecting and monitoring system has a safe and compact inspection vehicle.