An image pickup apparatus 1 having a lens unit 11A configured to include a plurality of lenses 17, 18, 19 and 20 and a variable aperture mechanism 31 capable of varying an aperture opening diameter, the image pickup apparatus 1 including: in the lens unit 11 A, a variable aperture unit 30 configured by integrating the variable aperture mechanism 31 and the single lenses 19 of the lens unit 11A using a fixing portion 35.
