CONSTRUCTION MACHINE

A turning work vehicle comprises a lower travel body, an upper turning body, a work device, a rotation body (113), and a support column (55). The lower travel body is provided with a blade (47). The upper turning body is supported by the lower travel body so as to be able to turn. The work device is supported by the upper turning body so as to be able to rotate. The rotation body (113) is provided to the blade (47). The support column (55) is provided so as to project from the rotation body (113). A target prism, which is the measurement object of a total station, can be secured to the support column (55). The rotation body (113) rotates in relation to the blade (47), whereby the posture of the support column (55) is configured so as to be able to switch between an upright posture and a fallen posture.