To provide a water treatment apparatus 1 which can supply a stable amount of pure water to external equipment without increasing an installation space.

The water treatment apparatus 1 comprises a water storage tank 6 storing first treated water obtained by purifying water to be treated, a purification portion 7 purifying the first treated water supplied from the water storage tank 6 to obtain second treated water, a feed pump 8 connected to predetermined external equipment and supplying the first treated water and/or the second treated water to the predetermined external equipment, a connecting line 10d connecting the purification portion 7 to the feed pump 8, and an auxiliary line 10e connecting the connecting line 10d to the water storage tank 6.

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