Provided is a lens apparatus capable of attaching an optical accessory on an object side thereof, in which: a lens protection lens barrel at an object-side end of the lens apparatus is retracted in an optical axis direction in response to attachment of an optical accessory support lens barrel supporting the optical accessory without changing placement of an optical system of the lens apparatus; and the lens protection lens barrel retracted in the optical axis direction is returned to a position before the attachment of the optical accessory support lens barrel by detaching the optical accessory support lens barrel from the lens apparatus.