A liquid treatment apparatus (100) according to the present disclosure includes a dielectric tube (101) through which water to be treated flows, a first electrode (102) at least a part of which is disposed in the dielectric tube (101), a second electrode (103) at least a part of which is disposed in the dielectric tube (101) at a position upstream of the first electrode (102), a gas supplier (105) that supplies a gas for generating a bubble (111) that covers a conductor-exposed portion of the first electrode (102), and a power supply (104) that applies a voltage between the first electrode (102) and the second electrode (103).
