An imaging device includes a first pixel. The first pixel has a photoelectric converting portion, a first capacitance element, and a first transistor. The photoelectric converting portion converts incident light into signal charge. The first capacitance element includes a first terminal and a second terminal, the first terminal being electrically connected to the photoelectric converting portion in at least a period of exposure. The first transistor includes a first source and a first drain, one of the first source and the first drain is electrically connected to the second terminal, and a direct-current potential is applied to the other of the first source and the first drain.