A vehicle includes a pair of front wheels, a pair of rear wheels, a frame portion, a first seat portion, a second seat portion, a third seat portion, a roll-over protection cage, and a three-point type seat belt unit for the second seat portion. The first seat portion, the second seat portion and the third seat portion are supported by the frame portion and disposed side by side in this order in a width direction of the vehicle. The roll-over protection cage is supported by the frame portion to provide covering above the first seat portion, the second seat portion and the third seat portion.