A method of producing a cell-containing container is provided, including a process in which pluripotent stem cells that have been induced to differentiate into neurons, and astrocytes are mixed and seeded in a cell culture container in which an electrode array is arranged on a culture surface, and a process in which the cell culture container is incubated, and as a result, the pluripotent stem cells and the astrocytes adhere to the culture surface, and the pluripotent stem cells differentiate into neurons.