The title compound, C17H18N2S2, exhibits a trans-trans-trans-gauche(+) (tttg (+)) conformation with regard to the NH-CH2-CH2-CH2-NH bond sequence. In the crystal, mol-ecules are connected by N-H⋯S=C and C-H⋯S=C hydrogen bonds, forming a herringbone arrangement along the c-axis direction. The two thioamide groups make dihedral angles of 43.0 (2) and 33.1 (2)° with the adjacent phenyl rings.