A hemodialyzing unit includes a dialytic fluid supply line for feeding a dialytic fluid from a dialytic fluid supply/discharge unit to a dialyzer, a dialytic fluid discharge line for feeding a dialytic fluid discharged from the dialyzer to the dialytic fluid supply/discharge unit, and a bypass line for connecting both lines at an intermediate portion of each. A flow rate adjusting member is provided to a downstream supply line between a coupling portion for coupling the dialytic fluid supply line to the bypass line and the dialyzer. A wider range of treatments such as CHD (or CHDF), SHD (or SHDF), and HD (or HDF) can be conducted without employing a device for the exclusive use of the CHD or CHDF.