A device for measuring the position of a surgical instrument , fitted with at least two limiters , wherein each limiter has a pass-through opening smaller than at least one part of the surgical instrument , through which parts of the surgical instrument are to be inserted, said device being in the shape of a rotationally mounted disk , which, on the inner side of its envelope, has a track that serves as a guide for the surgical instrument , characterized in that the first limiter is attached to the disk at one of the ends of said track and is configured so that when the surgical instrument is brought to the first stop and a part of the surgical instrument that is larger than the opening in the first limiter is pressed against the first limiter , rotation of the disk is caused, wherein at least one other limiter is attached to the disk by means of a pivotal measuring arm , and bringing a part of the surgical instrument that is larger than the opening in that other limiter to the second limiter and pressing it against said second limiter causes the second limiter to move , wherein the pass-through opening for inserting the surgical instrument in said at least one other limiter is smaller than the pass-through opening for inserting the surgical instrument in the limiter that precedes it when viewed from the side from which the surgical instrument is to be inserted, in particular, smaller than the pass-through opening for inserting the surgical instrument in the first limiter , wherein the disk and each of the limiters are fitted with means of resistance that act - with an appropriately matched force or torque - on the disk and on each of the limiters counteracting their movement under the influence of the pressure from the surgical instrument , wherein the device additionally has means for measuring the angle of rotation of the disk and the angle of pivoting of each of at least one measuring arm and converting the measurement result into an electrical signal. said device being in the shape of a rotationally mounted disk , which, on the inner side of its envelope, has a track that serves as a guide for the surgical instrument , characterized in that the first limiter is attached to the disk at one of the ends of said track and is configured so that when the surgical instrument is brought to the first stop and a part of the surgical instrument that is larger than the opening in the first limiter is pressed against the first limiter , rotation of the disk is caused, wherein at least one other limiter is attached to the disk by means of a pivotal measuring arm , and bringing a part of the surgical instrument that is larger than the opening in that other limiter to the second limiter and pressing it against said second limiter causes the second limiter to move , wherein the pass-through opening for inserting the surgical instrument in said at least one other limiter is smaller than the pass-through opening for inserting the surgical instrument in the limiter that precedes it when viewed from the side from which the surgical instrument is to be inserted, in particular, smaller than the pass-through opening for inserting the surgical instrument in the first limiter , wherein the disk and each of the limiters are fitted with means of resistance that act - with an appropriately matched force or torque - on the disk and on each of the limiters counteracting their movement under the influence of the pressure from the surgical instrument , wherein the device additionally has means for measuring the angle of rotation of the disk and the angle of pivoting of each of at least one measuring arm and converting the measurement result into an electrical signal. <EOS>