Electric storage device and electric storage module

An electric storage device includes a positive electrode 11, a negative electrode 13, and a separator 12 placed between the positive electrode 11 and the negative electrode 13, the positive electrode 11 has a positive electrode substrate 11A, a positive active material layer 11B formed on the positive electrode substrate 11A, and a protective layer 11C for covering at least one of side surfaces in a width direction of the positive active material layer 11B, the negative electrode 13 has a negative electrode substrate 13A and a negative active material layer 13B formed on the negative electrode substrate 13A, the separator 12 has a separator substrate 12A opposed to the negative active material layer 13B, and an inorganic layer 12B containing a binder, which is formed on the separator substrate 12A and opposed to the positive active material 11B, the inorganic layer 12B is larger in width than the positive active material layer 11B, and the protective layer 11C is adapted to protect the positive active material layer 11B from a component eluted from the binder.