A battery module and a method of manufacturing the same are disclosed herein. In some embodiments, a battery module includes a module case having an internal space formed by a top plate, a bottom plate and sidewalls of the module case, a plurality of battery cells disposed in the internal space, a first filler-containing cured resin layer in contact with both the top plate and the plurality of battery cells, and a second filler-containing cured resin layer in contact with both the bottom plate and the plurality of battery cells. The battery module can have excellent power relative to volume, while being manufactured in a simple process and at a low cost.