Aiming at providing a straddle-type all terrain vehicle effectively improved in the operational stability of vehicle and engine performance, power transmissions transmitting driving force of a power unit to a rear axle shaft, and braking devices exerting braking force to rear wheels are provided respectively at both side of an end of a rear swing arm in the vehicle width direction, and an exhaust silencer is disposed in a space between the power transmissions and the braking devices, below a seat.