A hydraulic drive system comprising: a first hydraulic pump (1; 2); a first hydraulic actuator (4; 7) driven by being supplied with a hydraulic fluid from the first hydraulic pump (1; 2), the first hydraulic actuator (4; 7) being a double-acting hydraulic cylinder or a bi-rotational hydraulic motor; a first line for supplying the hydraulic fluid from the first hydraulic pump (1; 2) to the first hydraulic actuator (4; 7); a first pump flow adjustment device (8; 13) installed in the first line, the first pump flow adjustment device (8; 13) being configured to adjust a flow of the hydraulic fluid from the first hydraulic pump (1; 2) to the first hydraulic actuator (4; 7), the first pump flow adjustment device (8; 13) being a directional control valve; a first hydraulic accumulator for accumulating the hydraulic fluid delivered from the first hydraulic pump (1; 2); a first accumulation flow adjustment device (16; 18) configured to adjust the flow of the hydraulic fluid from the first hydraulic pump (1; 2) to the first hydraulic accumulator; a first accumulation flow supply device (20; 26) configured to supply the hydraulic fluid accumulated in the first hydraulic accumulator to the first hydraulic actuator (4; 7) via a second line different from the first line, the first accumulation flow supply device (20; 26) being a directional control valve; a second hydraulic accumulator for accumulating the hydraulic fluid from the first hydraulic pump (1; 2); and a second accumulation flow adjustment device (17; 19) configured to adjust the flow of the hydraulic fluid from the first hydraulic pump (1; 2) to the second hydraulic accumulator, wherein the hydraulic drive system further comprises a third accumulation flow supply device (21; 27) configured to supply the hydraulic fluid accumulated in the second hydraulic accumulator to the first hydraulic actuator (4; 7) via a fifth line different from the first line and the second line, the third accumulation flow supply device (21; 27) being a directional control valve. a first hydraulic pump (1; 2); a first hydraulic actuator (4; 7) driven by being supplied with a hydraulic fluid from the first hydraulic pump (1; 2), the first hydraulic actuator (4; 7) being a double-acting hydraulic cylinder or a bi-rotational hydraulic motor; a first line for supplying the hydraulic fluid from the first hydraulic pump (1; 2) to the first hydraulic actuator (4; 7); a first pump flow adjustment device (8; 13) installed in the first line, the first pump flow adjustment device (8; 13) being configured to adjust a flow of the hydraulic fluid from the first hydraulic pump (1; 2) to the first hydraulic actuator (4; 7), the first pump flow adjustment device (8; 13) being a directional control valve; a first hydraulic accumulator for accumulating the hydraulic fluid delivered from the first hydraulic pump (1; 2); a first accumulation flow adjustment device (16; 18) configured to adjust the flow of the hydraulic fluid from the first hydraulic pump (1; 2) to the first hydraulic accumulator; a first accumulation flow supply device (20; 26) configured to supply the hydraulic fluid accumulated in the first hydraulic accumulator to the first hydraulic actuator (4; 7) via a second line different from the first line, the first accumulation flow supply device (20; 26) being a directional control valve; a second hydraulic accumulator for accumulating the hydraulic fluid from the first hydraulic pump (1; 2); and a second accumulation flow adjustment device (17; 19) configured to adjust the flow of the hydraulic fluid from the first hydraulic pump (1; 2) to the second hydraulic accumulator, wherein the hydraulic drive system further comprises a third accumulation flow supply device (21; 27) configured to supply the hydraulic fluid accumulated in the second hydraulic accumulator to the first hydraulic actuator (4; 7) via a fifth line different from the first line and the second line, the third accumulation flow supply device (21; 27) being a directional control valve.