In a vehicle body frame including a front frame portion extending rearward from a head pipe, and a rear frame portion extending downward or rearward from a rear end of the front frame portion, a forward portion of the rear frame portion, for example, a lumbar frame, includes a reduced-width portion overlapping with a vehicle body center line extending in a forward and rearward direction when viewed from above, and having a shape in which a width in a rightward and leftward direction is smaller than a length in an upward and downward direction. Devices incorporated into the motorcycle, such as a canister, a battery, an ABS unit, and a suspension unit, are laid out in spaces lateral relative to the reduced-width portion. Thus, the devices can be mounted to the vehicle body frame easily and efficiently.