A battery terminal unit includes a battery terminal that is assembled on a battery post and also includes a battery terminal stopper. The battery terminal stopper includes a first rotation preventing portion that abuts against a first abutment surface formed on a side surface of a battery housing in a state where the battery terminal is assembled on the battery post so as to be able to restrict rotation of the battery terminal about the battery post as the rotating center. The battery terminal stopper also includes a second rotation preventing portion that abuts against a second abutment surface formed on the battery housing along a direction intersecting with the first abutment surface in the assembled state so as to be able to restrict rotation of the battery terminal about the battery post as the rotating center.