Work machine

A working machine comprising:

• a plurality of hydraulic actuators;
• a variable displacement hydraulic pump for supplying pressure oil to these hydraulic actuators;
• and
• a load sensing system for controlling a discharge pressure of the hydraulic pump so as to render a differential pressure obtained by subtracting a maximum load pressure among the hydraulic actuators from a discharge pressure of the hydraulic pump to be a constant pressure, wherein
• the working machine is provided with:
• a first load pressure flow passage which introduces load pressures of the hydraulic actuators to be outputted to a PLS transmission line which transmits the maximum load pressure among the hydraulic actuators at the time of activating the hydraulic actuators;
• and
• a second load pressure flow passage which is a flow path for introducing the load pressures of the hydraulic actuators to be outputted to said PLS transmission line (44) during operation after activations of the hydraulic actuators, and wherein a flow rate of the pressure oil therein is reduced than that in said first load pressure flow passage.