A liquid supply pump includes: three chambers of a first liquid chamber, a second liquid chamber, and a third liquid chamber disposed in series and produced by dividing a space between an inlet channel into which liquid is supplied and an outlet channel from which liquid is delivered a first movable partition and a second movable partition which section the respective chambers and change the volumes of the chambers channels each of which penetrates the corresponding one of the first and second movable partitions so that the two adjoining chambers can communicated with each other and non-return valves each of which opens and closes the corresponding one of the channels. Each of the non-return valves closes when the corresponding movable partition shifts from the inlet channel side toward the outlet channel side, and opens when the corresponding movable partition shifts from the outlet channel side toward the inlet channel side.
