A state of a reference cell in a storage device is appropriately managed. A first memory cell array includes a first reference cell that generates reference potential of a sense amplifier. A second memory cell array includes a second reference cell that generates reference potential of a sense amplifier. A state storage unit stores, regarding each of the first and second reference cells, a state indicating certainty of a held value. When write to either one of the first and second reference cells is instructed, the write control unit controls the instructed write on the basis of the state regarding the first and second reference cells stored in the state storage unit.