A femoral neck inner side support structure (1) and a femoral neck fracture fixing device. The femoral neck inner side support structure (1) comprises a support part (10) and an attachment fixing part (11). The support part (10) and the attachment fixing part (11) are fixedly connected to each other. The support part (10) is provided with a structure matching the lower side surface of the near end of the femoral neck, the attachment fixing part (11) is provided with structures simultaneously matching the front side surface of the far end of the femoral neck and the front side surface of the upper end of the femoral shaft, and the attachment fixing part (11) is provided with at least one opening (1201) for allowing a screw (1301) to pass through on the structure matching the front side surface of the far end of the femoral neck, and at least one opening (1202, 1203) for allowing a screw (1302, 1303) to pass through on the structure matching the front side surface of the upper end of the femoral shaft. The femoral neck inner side support structure (1) well supports the femoral neck fracture part, so that the great torsion force and shear force borne by the femoral neck fracture part are reduced, the accurate positioning of the fracture part is assisted, and the stability and heal effect of the femoral neck fracture after reduction are ensured.La présente invention concerne une structure de support latéral interne du col du fémur (1) et un dispositif de fixation de fracture du col du fémur. La structure de support latéral interne du col du fémur (1) comprend une partie support (10) et une partie de fixation d'attache (11). La partie support (10) et la partie de fixation d'attache (11) sont solidarisées l'une à l'autre. La partie support (10) présente une structure correspondant à la surface latérale inférieure de l'extrémité proximale du col du fémur, la partie de fixation d'attache (11) présente des structures correspondant simultanément à la surface latérale avant de
