In the title compound, C13H15N3S, the 4,5-di-hydro-3H-1,2,4-triazole ring is nearly planar [maximum deviation = 0.020 (1) Å], while the cyclo-hexane ring adopts a chair conformation. The dihedral angle between the 4,5-di-hydro-3H-1,2,4-triazole ring and the phenyl ring is 74.68 (7)°. No specific inter-molecular inter-actions are discerned in the crystal packing.