To provide a saddle-riding type vehicle capable of being provided with various types of inclination angle sensors, while keeping the seat height low.

An inclination angle sensor 10 is positioned lower than the upper surface of a tandem seat 114, when viewing a motorcycle 100 in a lateral direction. Further, the inclination angle sensor 10 is arranged on the furthermore rear side than the front end of the tandem seat 114 and on the furthermore front side than the rear end thereof, when viewing the motorcycle 100 in a lateral direction. Furthermore, the inclination angle sensor 10 is arranged so as not to be overlapped on a vehicle center line L1 extending in the front-to-back direction of the motorcycle 100 and passing the center part in the width direction of a rear wheel 108, when viewing the motorcycle 100 from the upper side.