<p>A ball tap which can save water by, irrespective of whether or not there is a hand wash water discharge section, maintaining constant the amount of water which flows to the supplement water pipe side in order to supply supplemental water to a toilet unit. A ball tap (28) is provided with: a float (40) which ascends and descends in association with the movement of the level of flush water within the flush water tank (10); and a water supply valve (34) which is opened and closed by the descent and ascent of the float (40). The ball tap (28) automatically supplies water to the flush water tank (10) and stops the supply of the water. The ball tap (28) is also provided with: an outlet section (64) which is provided downstream of the water supply valve (34) and from which hand wash water flows toward a hand wash water discharge section (18) provided to the flush water tank (10); and a resistance member (96) which is provided to the outlet section (64) and changes flow path resistance.</p>
