A hydraulic circuit for a construction machine, the hydraulic circuit being connected to a first pump, a second pump, a tank, and a plurality of actuators (21A-23F), the hydraulic circuit comprising: a first unload passage connected to the first pump; a second unload passage connected to the second pump; a tank passage connected to the first unload passage, the second unload passage, and the tank; a plurality of directional control valves (51A to 53F) connected to the plurality of actuators (21A-23F), respectively, and configured to feed an oil from the first pump or the second pump to the plurality of actuators (21A-23F) and discharge to the tank the oil discharged from the plurality of actuators (21A-23F); a negative control pressure sensing unit configured to output, as a negative control pressure, the lower one of a pressure sensed by a first pressure sensing unit in a most downstream portion of the first unload passage and a pressure sensed by a second pressure sensing unit in a most downstream portion of the second unload passage; a regulator configured to control discharge rates of the first pump and the second pump in association with each other in accordance with the negative control pressure output from the negative control pressure sensing unit; characterized in that the hydraulic circuit further comprises: a recycling passage connected to a recycling actuator included in the plurality of actuators (21A-23F); and a sensing pressure rising passage (81, 82) connected to the recycling actuator; and in that the plurality of directional control valves (51A to 53F) include a recycling directional control valve configured to feed discharge oil from the second pump to the recycling actuator, the recycling passage is configured to perform pressure oil recycling, in which the recycling passage feeds recycling discharge oil discharged from the recycling actuator, to the actuator actuated with feeding of the discharge oil from the second pump, and the sensing pressure rising passage (81, 82) is configured to feed a part of the recycling discharge oil to the first unload passage upstream of the first pressure sensing unit or the second unload passage upstream of the second pressure sensing unit when the pressure oil recycling is performed a first unload passage connected to the first pump; a second unload passage connected to the second pump; a tank passage connected to the first unload passage, the second unload passage, and the tank; a plurality of directional control valves (51A to 53F) connected to the plurality of actuators (21A-23F), respectively, and configured to feed an oil from the first pump or the second pump to the plurality of actuators (21A-23F) and discharge to the tank the oil discharged from the plurality of actuators (21A-23F); a negative control pressure sensing unit configured to output, as a negative control pressure, the lower one of a pressure sensed by a first pressure sensing unit in a most downstream portion of the first unload passage and a pressure sensed by a second pressure sensing unit in a most downstream portion of the second unload passage; a regulator configured to control discharge rates of the first pump and the second pump in association with each other in accordance with the negative control pressure output from the negative control pressure sensing unit; characterized in that the hydraulic circuit further comprises: a recycling passage connected to a recycling actuator included in the plurality of actuators (21A-23F); and a sensing pressure rising passage (81, 82) connected to the recycling actuator; and in that the plurality of directional control valves (51A to 53F) include a recycling directional control valve configured to feed discharge oil from the second pump to the recycling actuator, the recycling passage is configured to perform pressure oil recycling, in which the recycling passage feeds recycling discharge oil discharged from the recycling actuator, to the actuator actuated with feeding of the discharge oil from the second pump, and the sensing pressure rising passage (81, 82) is configured to feed a part of the recycling discharge oil to the first unload passage upstream of the first pressure sensing unit or the second unload passage upstream of the second pressure sensing unit when the pressure oil recycling is performed a recycling passage connected to a recycling actuator included in the plurality of actuators (21A-23F); and a sensing pressure rising passage (81, 82) connected to the recycling actuator; and in that the plurality of directional control valves (51A to 53F) include a recycling directional control valve configured to feed discharge oil from the second pump to the recycling actuator, the recycling passage is configured to perform pressure oil recycling, in which the recycling passage feeds recycling discharge oil discharged from the recycling actuator, to the actuator actuated with feeding of the discharge oil from the second pump, and the sensing pressure rising passage (81, 82) is configured to feed a part of the recycling discharge oil to the first unload passage upstream of the first pressure sensing unit or the second unload passage upstream of the second pressure sensing unit when the pressure oil recycling is performed