  We report the first experimental observation of superconductivity in
Cd$_3$As$_2$ thin films without application of external pressure. Surface
studies suggest that the observed transport characteristics are related to the
polycrystalline continuous part of investigated films with homogeneous
distribution of elements and the Cd-to-As ratio close to stoichiometric
Cd$_3$As$_2$. The latter is also supported by Raman spectra of the studied
films, which are similar to those of Cd$_3$As$_2$ single crystals. The
formation of superconducting phase in films under study is confirmed by the
characteristic behavior of temperature and magnetic field dependence of samples
resistances, as well as by the presence of pronounced zero-resistance plateaux
in $dV/dI$ characteristics. The corresponding $H_c-T_c$ plots reveal a clearly
pronounced linear behavior within the intermediate temperature range, similar
to that observed for bulk Cd$_3$As$_2$ and Bi$_2$Se$_3$ films under pressure,
suggesting the possibility of nontrivial pairing in the films under
investigation. We discuss a possible role of sample inhomogeneities and crystal
strains in the observed phenomena.
