Changes in elastic constants of polycrystalline pure iron with cold rolling are determined. Young's modulus diminishes from 214 GPa to 193 GPa for 20% reduction thickness and increases with successive cold rolling to 210 GPa for 60% reduction. Poisson's ratio shows the same behaviour from 0.260 to 0.231 (20% reduction) and again to 0.264 (60% reduction). In both cases, the diminution and the first step of the increase may not be attributed to residual stresses, microstructural damage nor textures introduced during cold working. The initial compressive state in residual stresses remains practically steady during rolling (with values between -200 and -260 MPa). There was not a significant difference in textures between 0% and 20% reduction in which a preference of gamma fibre was detected; higher degrees of reduction made it possible to increase this fibre.