Terminal block with reinforcing rib and relief groove

A terminal block comprising:

• a main body in which a conductor is accommodated;
• an attachment integrally projecting from the main body, the attachment being fastened and fixed to an attached body by a fastening member;
• and
• a rotation regulator in contact with a positioning part of the attached body to position the main body when the attachment is fastened to the attached body by the fastening member, wherein
• the attachment has a recess at a root of the rotation regulator on a side in contact with the positioning part,
• the recess has a rounded surface at least on a side of the root of the rotation regulator,
• the rotation regulator is a reinforcing rib formed in a shape of a triangular plate located between a side wall of the main body and one of an upper face of the attachment or a lower face of the attachment, and
• the recess is a long relief groove formed along the root of the reinforcing rib in the shape of the triangular plate on the side in contact with the positioning part.