The invention relates to an agitating mill, in which the agitating shaft is provided with several disc-type milling elements. In previous models the milling discs were replaced by being removed disc by disc from the shaft, together with any spacers that were arranged in between and new discs were then mounted. According to the invention, the milling elements consist of several disc segments, which permits the replacement of individual milling elements without having to dismantle additional milling elements on the shaft.