An image pickup apparatus in which an imaging sensor package reflow mounted in advance to a circuit board can be fixed to a fixture member of the image pickup apparatus. A sensor holder of a digital video camera as an image pickup apparatus has a holder body that is positioned to surround an imaging sensor package mounted to a sensor board as a circuit board. Flange portions of the sensor holder are formed to project from a rear end surface of the holder body toward a heat radiation plate having a flat plate shape. The heat radiation plate is fixed to a lens barrel in a state that the flange portions are held between the lens barrel and the heat radiation plate.