Summary A positive electrode active material is provided to contain: a solid solution lithium-containing transition metal oxide represented by Li1. The digitals valves are operable to fluidly connect the corresponding hydraulic load to a pressure source. Further, a resin film is formed over the planarization layer and in the opening of the planarization layer, and the resin film also has an opening and an edge portion of the resin film formed at the opening of the resin film is rounded.