Using the Langmuir-Blodgett (LB) technique, thin films of PbBr-based layered perovskite having an organic-inorganic superlattice structure were successfully prepared. A monolayer of docosylammonium bromide was spread on a subphase containing lead bromide and methylammonium bromide. After being pressed to 30 mNm(-l), the monolayer was deposited on fused quartz substrates by the LB technique. The deposited film showed sharp and strong absorptions at approximately 390 nm which is characteristic of exciton in PbBr-based layered perovskite, demonstrating the formation of the layered perovskite structure. In addition, the X-ray diffraction measurement demonstrated that the layer structure is oriented parallel to the film plane; only diffraction peaks corresponding to (00n) of the PbBr-based layered perovskite were observed in the X-ray diffraction profile of the deposited him.