To provide a hydraulic pressure circuit for a foundation work executing machine, which necessarily synchronizes working apparatuses of the machine with each other when they are simultaneously elevated/lowered by two independent plunger pumps, and can elevate/lower the working apparatuses at high speed or low speed as needed.

The circuit is obtained by serially connecting a hydraulic pump 15 via an elevation switching valve 17 to a hydraulic motor A (22a and 22b) of the working apparatus 3 and to a hydraulic motor B (32a and 32b) of the working apparatus 4, and connecting a hydraulic pump 16 via a confluence switching valve 18 to an output side of the elevation switching valve 17. Further, a plurality of opening/closing solenoid valves 20a to 20e are provided in combination for the pipe arrangement of the circuit, whereby the working apparatuses 3 and 4 can be elevated/lowered singly or in synchronization with each other.