To provide an easy-to-use water treatment apparatus with little restriction on the installation location for a treatment unit.

The water treatment apparatus comprises a water faucet 1 for supplying raw water, a switching unit 2 attached to the water faucet 1 for switching the water channel for the raw water, and the treatment unit 3 for treating the raw water supplied from the switching unit 2. The switching unit 2 further includes a transmitter 4 for transmitting a signal for controlling the treatment unit 3, and the treatment unit 3 further includes a receiver 5 for receiving the signal from the transmitter 4. A relay unit 6 is disposed above the transmitter 4 and the receiver 5, including a reflecting plate 25 for reflecting and relaying the signal 4a from the transmitter 4 to the receiver 5.