A saddle-riding vehicle mounted with a V engine between a front wheel and a rear wheel, the V engine having a front cylinder portion extending obliquely forwardly and upwardly from a crankcase and a rear cylinder portion extending obliquely rearwardly and upwardly from the crankcase. A main switch is disposed between the front cylinder portion and the rear cylinder portion, and also an intake system is disposed between the front cylinder potion and the rear cylinder portion, wherein the main switch is fixed to the intake system. The main switch is disposed efficiently in terms of space utilization.