PURPOSE:To operate easily an auxiliary machine motor of a marine auxiliary machine controlling circuit and to reduce the quantity of a controlling electric wire, by providing a portable remote control board which contains an input/ output device connected to plural switches, and is connected so as to be insertable and detachable to and from a plug-in type joint box. CONSTITUTION:On and off signals are inputted to an input/output device 4' by a switch 6' of a portable type remote control board 12. This signal is inputted to a central processing unit 1 from a marine electric wire 5'. An output signal corresponding to this signal is transmitted from the central processing unit 1 in the shape of a time division signal, and it is inputted to a collected starter board 13 through a marine electric wire 5, a plug-in type joint box 3 and a marine electric wire 5''. As a result, the time division signal inputted to an input/output device 4'' is demodulated, a corresponding electromagnetic relay 7 operates, a contact 8 becomes on or off, a power source 10 supplies power or cuts it, and an auxiliary machine motor M is started. According to such a device, an electric wire annexed to a starting push-button and its fitting work are reduced.
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