A conical friction ring type CVT device configured with a ring interposed between opposing inclined surfaces of first and second friction wheels so as to surround the first wheel. A portion of the ring is submerged in an oil reservoir, and power is transmitted by contact between the ring and the first and second wheels, such that the ring in moves in the axial direction to steplessly changes speed. When the CVT device is mounted in a vehicle, a rotational direction is set such that, during forward travel of the vehicle, opposing, portions of the first and second wheels move upward from below. An oil strainer is disposed on a side of the second wheel opposite the axis of the first wheel with respect to the axis of the second wheel. Furthermore, a guide member is disposed on at least an upper portion of the second wheel.