PURPOSE: To provide an intake system of a front and rear wheel drive car in which an intake pipe, forcibly cooling air duct and cooling air duct for a transmission chamber in an engine are connected to a cleaner case, or combined together into a collecting pipe to be disposed on the lower side of a fuel tank in the water-proof way with cost reduction.

CONSTITUTION: A forced-air cooling engine 1 drives front and rear wheels 14, 18 through front and rear non-stage belt transmissions. An intake pipe 26, forced cooling air duct 27 and cooling air duct 28 for a transmission chamber in the engine 1 are connected to a cleaner case 23 or extended upward to be collected to a collecting pipe. An intake port 24 of the cleaner case 23 is provided in the upper surface and an inlet of the collecting pipe is disposed on the lower side of a fuel tank 22 in the front upper portion of a frame 21.