To provide a spinner unit structure where a propeller falls out from a rotary shaft safely and easily when external force larger than required is applied to the rotating propeller in the fitting structure of the propeller and a driving motor.

In this spinner unit for an electric radio control model plane, the propeller arranged at the center position of the rotary shaft of the rotor part end face of the driving motor is pressed to the rotor part end face with one or more magnets attracting magnetically with magnetic force which is equal to or greater than the thrust of the propeller by rotation, and the center part of the propeller is inserted in the recessed groove part of a spinner cap integrated with the magnet to be held and fixed with a rotating direction.