The asymmetric unit of the salt, (C(12)H(11)ClN)(2)[Ni(C(2)N(2)S(3))(2)], comprises one cation and a half of Ni(tdas)(2) (tdas = 1,2,5-thia-diazole-3,4-dithiol-ate) anion. The Ni(II) atom is located at a centre of inversion. The Ni(II) atom has a square-planar coordination with Ni-S distances of 2.2052 (4) and 2.1970 (5) Å. In crystal, weak C-H⋯S and C-H⋯Ni contacts are observed between the anions and cations.