The invention relates to an insertion instrument for an endoprosthesis (1), which comprises a neck part (12) and a shaft part (10) which is to be inserted into a medullary cavity, comprising a clamping device (2) which is provided with a holding fork (25) and a thrust bearing (26), which are embodied in such a manner that the endoprosthesis (1) is held fixedly in a clamped state and is released in an unclamped state, in addition to a striker device (3). The aim of the invention is to simplify the safe and precise insertion thereof such that a guide rail (23) for a striker element is arranged in a fixed manner on the clamping device (2) and is oriented in such a manner that a path, which is determined by the guide rail, leads to an end face of the endoprosthesis (1) which is held in the clamping device (2).
