Abstract: A work machine includes: a boom; a cylinder including a bottom chamber and a head chamber; a pump including a suction port and a discharge port; a hydraulic oil tank; an operation valve including a pump port connected to the discharge port, a bottom port connected to the bottom chamber, a head port connected to the head chamber, a tank port connected to the hydraulic oil tank, and a regenerative port connected to the suction port via a regenerative line; an accumulator connected to the regenerative line via an accumulator line; a switching valve that adjusts a flow rate of hydraulic oil in the accumulator line; and a controller that controls the boom operation valve and the switching valve so that hydraulic oil emitted from the bottom chamber is distributed to each of the suction port and the accumulator in a lowering operation of the boom.