PROBLEM TO BE SOLVED: To perform water supply in a flow rate equally to each of water supply destinations by arranging outlet heights of water diversion tubes to be uniform in height, thereby making hydraulic head differences between water level in a water supply tank and the outlets of a plurality of the water diversion tubes be the same.SOLUTION: A water supply system 10 comprises a plurality of water diversion tubes 16 and distributes and supplies water in a water supply tank (12) to a plurality of water supply destinations. Each of the plurality of water diversion tubes 16 is connected to the water supply tank (12) via, e.g, horizontal piping 14 and each of outlet heights of the plurality of water diversion tubes 16 is arranged to be uniform in height and is held by a holding part (24a). Thus, water is flowed out in an atmospheric open state from each of outlets 16a of the plurality of water diversion tubes 16 and the flowed out water is received by a plurality of introduction parts 24 individually to be conveyed to respective water supply destinations.
