A hydraulic pressure control device comprising: a hydraulic pump for discharging hydraulic oil; an electric motor for driving the hydraulic pump; at least one hydraulic actuator (35, 36) driven by the hydraulic oil discharged from the hydraulic pump; hydraulic actuator operation means operable to control actuation of the at least one hydraulic actuator (35, 36); discharge pressure detection means for detecting the discharge pressure of the hydraulic oil discharged by the hydraulic pump; hydraulic oil pressure detection means for detecting the hydraulic oil pressure of the hydraulic actuator (35, 36); electric power supply means for supplying electric power to the electric motor and driving the electric motor; and a controller for determining a pressure difference between the discharge pressure of the hydraulic pump detected by the discharge pressure detection means and the hydraulic oil pressure of the hydraulic actuator (35, 36) detected by the hydraulic oil pressure detection means, and for controlling the supply of electric power to the electric motor by the electric power supply means so that the pressure difference reaches a predetermined set value, to control the driving of the hydraulic pump by the electric motor, characterized in that the hydraulic pressure control device further comprises pressure difference operation means operable in order to variably set the set value, and configured so that information showing the set value set by the operation of the pressure difference operation means is sent to the controller; the controller being adapted to control the supply of electric power to the electric motor by the electric power supply means to control the driving of the hydraulic pump by the electric motor so that the pressure difference between the discharge pressure of the hydraulic pump detected by the discharge pressure detection means and the hydraulic oil pressure of the hydraulic actuator detected by the hydraulic oil pressure detection means reaches the set value that has been set by the operation of the pressure difference operation means. a hydraulic pump for discharging hydraulic oil; an electric motor for driving the hydraulic pump; at least one hydraulic actuator (35, 36) driven by the hydraulic oil discharged from the hydraulic pump; hydraulic actuator operation means operable to control actuation of the at least one hydraulic actuator (35, 36); discharge pressure detection means for detecting the discharge pressure of the hydraulic oil discharged by the hydraulic pump; hydraulic oil pressure detection means for detecting the hydraulic oil pressure of the hydraulic actuator (35, 36); electric power supply means for supplying electric power to the electric motor and driving the electric motor; and a controller for determining a pressure difference between the discharge pressure of the hydraulic pump detected by the discharge pressure detection means and the hydraulic oil pressure of the hydraulic actuator (35, 36) detected by the hydraulic oil pressure detection means, and for controlling the supply of electric power to the electric motor by the electric power supply means so that the pressure difference reaches a predetermined set value, to control the driving of the hydraulic pump by the electric motor, characterized in that the hydraulic pressure control device further comprises pressure difference operation means operable in order to variably set the set value, and configured so that information showing the set value set by the operation of the pressure difference operation means is sent to the controller; the controller being adapted to control the supply of electric power to the electric motor by the electric power supply means to control the driving of the hydraulic pump by the electric motor so that the pressure difference between the discharge pressure of the hydraulic pump detected by the discharge pressure detection means and the hydraulic oil pressure of the hydraulic actuator detected by the hydraulic oil pressure detection means reaches the set value that has been set by the operation of the pressure difference operation means.