A work machine comprising: a machine body; a front work implement that is an articulated type, is attached to the machine body, and includes a plurality of front members rotatably connected to each other; and a plurality of hydraulic actuators, which comprises a boom cylinder, that respectively drive the plurality of front members of the front work implement in accordance with operation signals; the work machine characterized by further comprising: a load measuring system that includes, as work load sensors, a boom cylinder bottom pressure sensor detecting a hydraulic pressure of a hydraulic chamber on the bottom side of the boom cylinder and a boom cylinder rod pressure sensor detecting a hydraulic pressure of a hydraulic chamber on the rod side of the boom cylinder, a plurality of posture information sensors detecting posture information that is information associated with respective postures of the plurality of front members and the machine body, and a controller calculating a load value as a weight of a transportation target carried by the front work implement based on detection results obtained by the work load sensors and the posture information sensors; and a display device disposed inside a cab boarded by an operator, wherein the controller is configured to change a load threshold used for determining whether to recalibrate the load measuring system in accordance with a posture index value that is an index concerning a posture of the front work implement and obtained based on the detection results of the posture information sensors, and the controller determines whether to recalibrate the load measuring system based on a calculation result of the load value and the changed load threshold, and displays a determination result on the display device. a machine body; a front work implement that is an articulated type, is attached to the machine body, and includes a plurality of front members rotatably connected to each other; and a plurality of hydraulic actuators, which comprises a boom cylinder, that respectively drive the plurality of front members of the front work implement in accordance with operation signals; the work machine characterized by further comprising: a load measuring system that includes, as work load sensors, a boom cylinder bottom pressure sensor detecting a hydraulic pressure of a hydraulic chamber on the bottom side of the boom cylinder and a boom cylinder rod pressure sensor detecting a hydraulic pressure of a hydraulic chamber on the rod side of the boom cylinder, a plurality of posture information sensors detecting posture information that is information associated with respective postures of the plurality of front members and the machine body, and a controller calculating a load value as a weight of a transportation target carried by the front work implement based on detection results obtained by the work load sensors and the posture information sensors; and a display device disposed inside a cab boarded by an operator, wherein the controller is configured to change a load threshold used for determining whether to recalibrate the load measuring system in accordance with a posture index value that is an index concerning a posture of the front work implement and obtained based on the detection results of the posture information sensors, and the controller determines whether to recalibrate the load measuring system based on a calculation result of the load value and the changed load threshold, and displays a determination result on the display device. a load measuring system that includes, as work load sensors, a boom cylinder bottom pressure sensor detecting a hydraulic pressure of a hydraulic chamber on the bottom side of the boom cylinder and a boom cylinder rod pressure sensor detecting a hydraulic pressure of a hydraulic chamber on the rod side of the boom cylinder, a plurality of posture information sensors detecting posture information that is information associated with respective postures of the plurality of front members and the machine body, and a controller calculating a load value as a weight of a transportation target carried by the front work implement based on detection results obtained by the work load sensors and the posture information sensors; and a display device disposed inside a cab boarded by an operator, wherein the controller is configured to change a load threshold used for determining whether to recalibrate the load measuring system in accordance with a posture index value that is an index concerning a posture of the front work implement and obtained based on the detection results of the posture information sensors, and the controller determines whether to recalibrate the load measuring system based on a calculation result of the load value and the changed load threshold, and displays a determination result on the display device.