A fluid pressure control device for controlling an actuator driven by a working fluid discharged from a pump, the fluid pressure control device comprising: a pump, a tank, a main valve block, and a sub valve block attachable to the main valve block, wherein the main valve block includes a control valve connected to the pump and configured to control a main actuator, a neutral passage through which the working fluid from the pump returns to the tank when the control valve is at a neutral position, a discharge passage connected to the tank, a neutral cut valve that makes the neutral passage and the discharge passage communicate with each other or blocks communication between the neutral passage and the discharge passage, and a first external output port and a second external output port through which the working fluid discharged from the pump is able to be supplied to outside via the neutral cut valve, the sub valve block includes a control valve configured to control a sub actuator, and the control valve of the sub valve block is connected to the first external output port, wherein the neutral cut valve has a first position at which the neutral passage and the discharge passage communicate with each other, communication between the neutral passage and the first external output port is blocked, and communication between the neutral passage and the second external output port is blocked, a second position at which the neutral passage and the second external output port communicate with each other, communication between the neutral passage and the first external output port is blocked, and communication between the neutral passage and the discharge passage is blocked, and a third position at which the neutral passage and the first external output port communicate with each other, communication between the neutral passage and the second external output port is blocked, and communication between the neutral passage and the discharge passage is blocked. a pump, a tank, a main valve block, and a sub valve block attachable to the main valve block, wherein the main valve block includes a control valve connected to the pump and configured to control a main actuator, a neutral passage through which the working fluid from the pump returns to the tank when the control valve is at a neutral position, a discharge passage connected to the tank, a neutral cut valve that makes the neutral passage and the discharge passage communicate with each other or blocks communication between the neutral passage and the discharge passage, and a first external output port and a second external output port through which the working fluid discharged from the pump is able to be supplied to outside via the neutral cut valve, the sub valve block includes a control valve configured to control a sub actuator, and the control valve of the sub valve block is connected to the first external output port, wherein the neutral cut valve has a first position at which the neutral passage and the discharge passage communicate with each other, communication between the neutral passage and the first external output port is blocked, and communication between the neutral passage and the second external output port is blocked, a second position at which the neutral passage and the second external output port communicate with each other, communication between the neutral passage and the first external output port is blocked, and communication between the neutral passage and the discharge passage is blocked, and a third position at which the neutral passage and the first external output port communicate with each other, communication between the neutral passage and the second external output port is blocked, and communication between the neutral passage and the discharge passage is blocked.