A fuse unit includes: a fusible link which is connected to a battery terminal and of which a fuse is fused when overcurrent flows therein; and a holding mechanism including a base portion that is interposed between a post-standing surface and the battery terminal in a state in which the battery terminal is fastened to a battery post provided on the post-standing surface of a battery housing, and a holding portion that is connected to the base portion and holds the fusible link on the post-standing surface. Accordingly, a load acting on the battery post can be suppressed.