A solid-state imaging device includes a plurality of pixels each including a photoelectric conversion element and a signal amplification element which receives a signal from the photoelectric conversion element to amplify and output the signal, a signal amplifier including a first input terminal which receives the signal from the signal amplification element and a second input terminal into which a reference voltage is input, and a reference electric power supply, which supplies the reference voltage to the second input terminal of the signal amplifier, the reference electric power supply including a circuit configuration equivalent to the signal amplification element.