A hydraulic circuit control device comprising: a hydraulic actuator which is operated by means of hydraulic fluid; and a solenoid-operated variable pressure relief valve adapted to control pressure of the hydraulic fluid fed to the hydraulic actuator at a set relief pressure (Prel) that can be electrically commanded; characterised in that the hydraulic circuit control device further comprises a control means including: an override compensation pressure calculation section for calculating an override compensation pressure (ΔP) based on input signals related to the set relief pressure (Prel) and a relief valve passing flow rate (Qatt) of the solenoid-operated variable pressure relief valve, and a subtraction section for calculating a set relief pressure that results from compensation of pressure override and that serves as a commanded pressure, by subtracting the override compensation pressure (ΔP), which corresponds to the relief valve passing flow rate (Qatt) and has been calculated by the override compensation pressure calculation section, from the set relief pressure (Prel), and a converter adapted to convert the commanded pressure calculated by the subtraction section to an electric current value and output the electric current value to the solenoid operated variable pressure relief valve. a hydraulic actuator which is operated by means of hydraulic fluid; and a solenoid-operated variable pressure relief valve adapted to control pressure of the hydraulic fluid fed to the hydraulic actuator at a set relief pressure (Prel) that can be electrically commanded; characterised in that the hydraulic circuit control device further comprises a control means including: an override compensation pressure calculation section for calculating an override compensation pressure (ΔP) based on input signals related to the set relief pressure (Prel) and a relief valve passing flow rate (Qatt) of the solenoid-operated variable pressure relief valve, and a subtraction section for calculating a set relief pressure that results from compensation of pressure override and that serves as a commanded pressure, by subtracting the override compensation pressure (ΔP), which corresponds to the relief valve passing flow rate (Qatt) and has been calculated by the override compensation pressure calculation section, from the set relief pressure (Prel), and a converter adapted to convert the commanded pressure calculated by the subtraction section to an electric current value and output the electric current value to the solenoid operated variable pressure relief valve. an override compensation pressure calculation section for calculating an override compensation pressure (ΔP) based on input signals related to the set relief pressure (Prel) and a relief valve passing flow rate (Qatt) of the solenoid-operated variable pressure relief valve, and a subtraction section for calculating a set relief pressure that results from compensation of pressure override and that serves as a commanded pressure, by subtracting the override compensation pressure (ΔP), which corresponds to the relief valve passing flow rate (Qatt) and has been calculated by the override compensation pressure calculation section, from the set relief pressure (Prel), and a converter adapted to convert the commanded pressure calculated by the subtraction section to an electric current value and output the electric current value to the solenoid operated variable pressure relief valve.