An imaging apparatus includes a lens barrel unit, an image sensor substrate having an image sensor, a metal plate to which an image sensor substrate is fixed, a lens barrel holder made of a metal material and configured to support the lens barrel unit, a third cover member made of a heat-conductive resin material fixed to the lens barrel holder and configured to cover the circumferential surface of the lens barrel unit, and a heat-conductive member configured to conduct heat of an image sensor sheet metal to the lens barrel holder. At least a part of the lens barrel holder is disposed inside the third cover member.