Abstract: The present invention relates to a driving instrument for driving a spike for thigh-bone necks, for fixing bone fragments (35, 36) at bone fractures, preferably fractures of the thigh-bone neck, whereby the fixing instrument (1) comprises a sleeve (2), a pin (8) provided in the sleeve (2) and a driving device (12, 13) connected to the sleeve (2) for driving the end portion (9) of the pin (8) out of the sleeve (2) via a side opening (7) therein and into a certain part (38) of surrounding bone material. In order to provide a simple way to determine the position of the driving instrument itself and allow for an exact determination of the position of the spike sleeve, whereby eventual adjustment of the position of the spike sleeve to set the opening exactly, may be carried out quickly and without risk of errors in setting or loosening of the instrument, a portion (13) of the driving device (12, 13) connected to the sleeve (2) holds a maneuvering member ( 11) unrotatably connected to the sleeve (2).