An imaging element includes a photoelectric conversion unit including a first electrode, a photoelectric conversion layer, and a second electrode that are stacked, in which an inorganic oxide semiconductor material layer is formed between the first electrode and the photoelectric conversion layer, and the inorganic oxide semiconductor material layer includes at least two types of elements selected from the group consisting of indium, tungsten, tin, and zinc. Alternatively, a LUMO value E1 of a material included in a part of the photoelectric conversion layer positioned near the inorganic oxide semiconductor material layer and a LUMO value E2 of a material included in the inorganic oxide semiconductor material layer satisfy E1-E2