[en] We report the results of electrical resistivity, magnetic, and thermodynamic measurements on polycrystalline SnSb, whose structure consists of stacks of Sb bilayers and Sn₄Sb₃ septuple layers along the c-axis. The material is found to be a weakly coupled, fully gapped, type-II superconductor with a bulk T _c of 1.50 K, while showing a zero resistivity transition at a significantly higher temperature of 2.48 K. The Sommerfeld coefficient and upper critical field, obtained from specific heat measurements, are 2.29 mJ mol⁻¹ K⁻² and 520 Oe, respectively. Compositional inhomogeneity and strain effect at the grain boundaries are proposed as possible origins for the difference in resistive and bulk superconducting transitions. In addition, a comparison with the rock-salt structure SnAs superconductor is presented. Our results provide the first clear evidence of bulk superconductivity in a natural superlattice derived from a topological semimetal. (paper)