The effect of crystalline structure on the magnetic, transport and optical properties of thin film and partly bulk Ni–Mn–In alloy samples have been investigated. The atomic disorder practically does not effect on the magnetization of the Ni–Mn–In alloy films at room temperature but impact significantly on their temperature dependencies, and also changes the metallic–like temperature dependence of resistivity on semiconductor-like. The temperature dependencies of resistance of $L$2$_1$ type ordered crystalline film and bulk samples look similar each other differing only by the point where the temperature coefficient of resistivity is changed at the Curie temperature. The significant changes in the optical properties of bulk and film Ni–Mn–In samples induced by structural ordering upon annealing (bulk sample) or crystallization of amorphous phase and formation of $L$2$_1$ ordered phase indicate on drastic changes in the electronic structures of alloys. The analysis of the optical results in terms of band structure has been suggested.