To provide a device capable of surely and efficiently maintaining straightness when driving a casing.

A casing guide device 1 includes a plurality of guide rollers 5, 6 which can abut on a casing 2 during driving and can guide the casing in a driving direction thereof. Each of the guide rollers is provided so as to be individually in a positionally adjustable manner. The plurality of upper stage guide rollers 5 and the plurality of lower stage guide rollers 6 constitute holding means which can hold the casing, respectively. Each of the guide rollers abuts always on an outer peripheral surface of the casing so that the casing is guided in the driving direction while maintaining straightness. Since the guide rollers abutting on the outer peripheral surface of the casing freely rotate in the driving direction, friction interrupting driving is not caused between the guide rollers and the casing. The guide rollers abut always on the outer peripheral surface of the casing so that a situation where the casing during driving applies repeatedly percussion force to guide materials and the like can be prevented.