A dynamic mixer for mixing flowable media, which has a mixing chamber in a multipart housing is described. A plurality of inlets and an outlet of the mixing chamber are arranged on the housing, and a mixing shaft having a mixer section projects into the mixing chamber. The mixing shaft is mounted in a sliding bearing in the housing by means of a bearing section and passes through the housing with a drive section for coupling to a drive. To avoid dead spaces within the housing, the housing has a sealing hole for accommodating the drive section of the mixing shaft and a bearing hole for mounting the bearing section of the mixing shaft, where the sealing hole has a greater diameter than the bearing hole in order to accommodate a sealing means.