A fluid control device of a closed center circuit type having a configuration in which a plurality of fluid control valves (2;3;4) are arranged in a row, the fluid control valves (2;3;4) each including a body having a port connectable to an actuator, a flowrate adjusting member configured to adjust a flowrate of a hydraulic fluid passing through a flow path formed in the body, and a pressure compensation valve (21;3 1;41), the fluid control device comprising: a main relief valve having a relief characteristic corresponding to a pressure of a hydraulic fluid supplied to a fluid control valve corresponding to a function requiring the maximum load pressure among the plurality of fluid control valves (2;3;4); a secondary relief valve having a relief characteristic corresponding to a pressure of a hydraulic fluid supplied to a plurality of fluid control valves (3;4) other than the fluid control valve corresponding to the function requiring the maximum load pressure among the plurality of fluid control valves (2;3;4); a first passage connecting a load handling line of the fluid control valve corresponding to the function requiring the maximum load pressure among the plurality of fluid control valves (2;3;4), the main relief valve, and the pressure compensation valves (21;31;41) in the plurality of respective fluid control valves (2;3;4); a second passage connecting load handling lines (132; 142) of the plurality of fluid control valves (3;4) other than the fluid control valve corresponding to the function requiring the maximum load pressure among the plurality of fluid control valves (2;3;4) and the secondary relief valve; check valves (92;93) disposed in respective passages connecting the load handling lines (132;142) of the plurality of fluid control valves (3;4) other than the fluid control valve corresponding to the function requiring the maximum load pressure among the plurality of fluid control valves (2;3;4) and the second passage; and a passage switching unit configured to send the hydraulic fluid having the higher pressure out of the hydraulic fluid in the load handling line of the fluid control valve corresponding to the function requiring the maximum load pressure among the plurality of fluid control valves (2;3;4) and the hydraulic fluid in the second passage to the main relief valve and the pressure compensation valves (21;31;41) in the plurality of respective fluid control valves (2;3;4) through the first passage. a main relief valve having a relief characteristic corresponding to a pressure of a hydraulic fluid supplied to a fluid control valve corresponding to a function requiring the maximum load pressure among the plurality of fluid control valves (2;3;4); a secondary relief valve having a relief characteristic corresponding to a pressure of a hydraulic fluid supplied to a plurality of fluid control valves (3;4) other than the fluid control valve corresponding to the function requiring the maximum load pressure among the plurality of fluid control valves (2;3;4); a first passage connecting a load handling line of the fluid control valve corresponding to the function requiring the maximum load pressure among the plurality of fluid control valves (2;3;4), the main relief valve, and the pressure compensation valves (21;31;41) in the plurality of respective fluid control valves (2;3;4); a second passage connecting load handling lines (132; 142) of the plurality of fluid control valves (3;4) other than the fluid control valve corresponding to the function requiring the maximum load pressure among the plurality of fluid control valves (2;3;4) and the secondary relief valve; check valves (92;93) disposed in respective passages connecting the load handling lines (132;142) of the plurality of fluid control valves (3;4) other than the fluid control valve corresponding to the function requiring the maximum load pressure among the plurality of fluid control valves (2;3;4) and the second passage; and a passage switching unit configured to send the hydraulic fluid having the higher pressure out of the hydraulic fluid in the load handling line of the fluid control valve corresponding to the function requiring the maximum load pressure among the plurality of fluid control valves (2;3;4) and the hydraulic fluid in the second passage to the main relief valve and the pressure compensation valves (21;31;41) in the plurality of respective fluid control valves (2;3;4) through the first passage.