A lens apparatus which enables to reduce size is disclosed. The lens apparatus has a first member which is movable in the optical axis direction and holds a first lens unit; a second member which holds a second lens unit and the first member; a first motor which is mounted to the second member and generates a driving force for driving the first member; a diaphragm unit which is mounted to the second member and performs open and close operations; a second motor which is mounted to the second member and generates a driving force for driving the diaphragm unit; and a guide member which is mounted to the second member and guides the first member in the optical axis direction.