From the high-resolution time-of-flight neutron powder diffraction data, the crystal structure of Sr 2 SnO 4 at the temperature range between 4 and 300K has been investigated. The Rietveld refinement has shown that Sr 2 SnO 4 belongs to the space group Pccn, which can be derived from the tetragonal K 2 NiF 4 structure by tilting the SnO 6 octahedra along the [100] T - and [010] T -axis, respectively, with non-equal tilts. The earlier reported first-order phase transition in Sr 2 SnO 4 , from Bmab to P4 2 /ncm, has not been observed.