WORK RANGE CONTROL DEVICE OF WORK MACHINE

PROBLEM TO BE SOLVED: To improve both workability and stability during work with a front device, regarding a work range control device of a work machine.SOLUTION: A work range control device of a work machine includes rotary attitude detection means 11L and 11R for detecting a rotary attitude of an upper rotary body in relation to a lower traveling body. The work range control device also includes first storage means 32 for storing a side work range as a work range of the front device and second storage means 33 for storing a front work range in which a horizontal distance from a machine body center of the work machine up to an outer end is set to be larger than the side work range as the work range of the front device. Further, the work range control device includes control means 37 for limiting the work range of the front device to limit the work range to the inside of the side work range when the rotary attitude is a side attitude. When the rotary attitude is a front attitude, the work range is expanded up to the inside of the front work range.