The present invention relates to a remote control system (6) of a propulsion unit (1) of a watercraft having a shift mechanism for switching a rotation of a propeller shaft, with the propeller shaft being driven by an output power of an internal combustion engine (9), an internal combustion engine electronic control unit (7) for controlling a drive state of the internal combustion engine (9), and a remote controller (6) capable of transmitting a control signal to the internal combustion engine electronic control unit (7) to achieve a target drive state, wherein a shift cutout control unit having an ignition control means (17) provided for initiating an ignition cutout in internal combustion engine (9) when an operating position signal from a lever position detector (18) for detecting an operating position of the control lever indicates the position of the control lever in neutral, and at the same time a shift position signal from a shift position detector (19) indicates a shift position not in neutral.