A vehicle includes a suspension that supports a front wheel thereon, and a road surface state decision unit that decides a road surface state by detection of an acceleration sensor. The acceleration sensor is provided at a lower portion of the suspension and is capable of detecting an acceleration at least in a one-axis direction. The suspension is a front fork that supports the front wheel of the saddle riding vehicle. The front fork includes a bottom case that connects a lower portion of the front fork and an axle of the front wheel to each other. The acceleration sensor is attached to the bottom case.