An insertion instrument for instrumented insertion of a socket insert (4) having a spherical cap (20) into a hip socket (5) of a hip joint prosthesis, comprising an impacting instrument (1) with a handle (7), at the end of which a holding tool for the socket insert (4) is located, characterized in that the one end (8) of the impacting instrument (1) is spherically formed and is part of the holding tool, and the holding tool furthermore comprises an impacting head (2) which is designed as a separate component and serves for receiving the spherical end (8) of the impacting instrument (1) in an articulated manner, and an insertion aid (3) which is designed as a separate component and serves for holding the socket insert (4) on the outer geometry of the impacting head (2), and the impacting head (2) can be connected to the spherical end (8), thereby forming a ball joint.