To provide a working machine control device for automatically extending a working machine mounted on a vehicle via a boom mechanism corresponding to a plurality of target extended positions different depending on working sites, when moved from a stored condition to the target extended position.

The control device comprises a control means 22 for driving a working machine moving means 20, a movement passage storing means 23 for previously storing a plurality of types of movement passages for movement from the stored condition via a preset passage to the target extended position, corresponding to the plurality of target extended positions, a selecting means 25 for selecting the movement passage to the target extended position from the plurality of movement passages stored in the movement passage storage means 23, and a control starting means 26 for giving a control starting command. The control means 22 has automatic control function for controlling the working machine moving means 20 to move the working machine through the selected movement passage to the target extended position in accordance with the starting command and the selected movement passage.