A transmitting system for a small-sized vehicle having an engine and a multi-stage transmission comprising a crankshaft of the engine, an input shaft of the multi-stage transmission, a shifting clutch and a primary reducing device. The input shaft is disposed in parallel to the crankshaft and the crankshaft and input shaft are connected to each other through a fluid transmitting means. The fluid transmitting means including a pump impeller leading to the engine, and a turbine impeller leading to the multi-stage transmission. The fluid transmitting means and the shifting clutch are mounted on the crankshaft of the engine and connected in series to each other. One of the fluid transmitting means and the shifting clutch is connected to the crankshaft, and the other is connected to the input shaft of the multi-stage transmission through the primary reducing device.