CONSTRUCTION MACHINE WITH CALIBRATION CONTROLLER

When a work implement 3 is actuated in such a manner that a work point is located at each of a plurality of positions on a datum line, a first work point position computing section 40b calculates a position of the work point at each of the plurality of positions. A calibration value computing section 49b calculates calibration values of angle conversion parameters (±bm, ²bm, ±am, ²am, ±bk, ²bk), dimension parameters (Lbm, Lam, Lbk), and line parameters (tilt tan¸, intercept Zline) using the fact that the positions of the work point at each of the plurality of positions calculated by the first work point position computing section 40b can satisfy a linear equation indicating a datum line. A parameter update section 49c reflects the calibration values calculated by the calibration value computing section 49b in computation by a corresponding computing section 40a that is one of the angle computing section and the first work point position computing section 40b.