case 111 and a detection switch 117 for detecting the rotation of the rotating shaft 112 and for detecting the condition of the stopper arm 115 the reverse lock 110 is to prevent a shift change from being made into reverse by restricting the rotation of the drum 114 incidentally the motor vehicle 10 of a saddle riding type according to the present invention is a four wheeled vehicle as shown in fig2 however the motor vehicle is not limited to this the motor vehicle 10 of a saddle riding type may be a three wheeled vehicle with regard to the motor vehicle 10 of a saddle riding type according to the present invention the operation unit is the actuator knob 51 as shown in fig4 however the actuator is not limited to this the actuator may be what is shaped for example like a lever with regard to the motor vehicle 10 of a saddle riding type according to the present invention the tab 76 and the extended portion 77 of the actuator knob 51 are formed as separated bodies as shown in fig7 however the tab 76 and the extended portion 77 are not limited to this the tab 76 and the extended portion 77 of the operation knob 51 may be formed integrally with regard to the motor vehicle 10 of a saddle riding type according to the present invention the rotation angle of the actuator knob 51 is.