A fuse unit for connecting a battery, including a fuse element having an external connection plate part to which a screw terminal fitting is screwed, a resin-made fuse housing for supporting the fuse element, and a rotation regulating part for stopping rotation of the screw terminal fitting screwed to the external connection plate part, the rotation regulating part includes a terminal abutting part which is formed by folding one edge of the external connection plate part and stops the rotation by abutting on one side edge of the screw terminal fitting, and a cover part which is formed integrally to the fuse housing and covers a back surface of the terminal abutting part.