An image reading apparatus includes a light receiving element configured to receive light from an image to perform photoelectric conversion, an amplification unit configured to amplify a signal generated by the photoelectric conversion, a switch element electrically connected to first and second ends of the amplification unit to be in parallel with the amplification unit, and a capacitor. The capacitor is electrically connected to the first and second ends of the amplification unit to be in parallel with to the amplification unit, and includes a first wire electrically connecting a first end of the light receiving element, the first end of the amplification unit, and a first end of the switch element, and a second wire electrically connecting the second end of the amplification unit and a second end of the switch element. The capacitor includes capacitance that is interconnect capacitance between the first and second wires.