WORK MACHINE

An installation error of a machine-body inertial measurement unit 13 around a first axis that is set forward perpendicularly to a swing axis of an upper swing structure 2 is computed on a basis of sensing results of inertial measurement units 14 to 16 of a front work implement 1, and the machine-body inertial measurement unit 13 obtained while the upper swing structure 2 is in a first calibration posture in which the upper swing structure 2 faces a predetermined direction relative to a lower travel structure 3; and an installation error of the machine-body inertial measurement unit 13 around a second axis that is set laterally perpendicularly to the swing axis of the upper swing structure 2, and to the first axis is computed on a basis of a sensing result of the machine-body inertial measurement unit 13 obtained while the upper swing structure 2 is in a second calibration posture in which the upper swing structure 2 is swung by 90 degrees relative to the lower travel structure 3 from the first calibration posture, and the installation error of the machine-body inertial measurement unit 13 around the first axis. Thereby, installation errors of sensors for sensing postural information can be computed precisely, and the sensor calibration precision can be enhanced.