WORK MACHINE

A work machine includes: a swing structure; a work device; a position sensor that senses position information of the swing structure; a posture sensor that senses information about the posture of the work machine; and a controller that performs machine control on the basis of a target surface set on the basis of target shape data, the position information of the swing structure, and the information about the posture of the work machine. When the controller becomes unable to obtain the position information of the swing structure by the position sensor, the controller stores, as reference swing angle information, swing angle information of the swing structure, the swing angle information being sensed by the posture sensor at that time. The controller prohibits execution of the machine control when the swing structure is positioned outside a swing range set on the basis of the reference swing angle information. The controller permits the execution of the machine control when the swing structure is positioned inside the swing range and when the swing structure is positioned inside the swing range again after being positioned outside the swing range.