The lens barrel has a first lens unit that is disposed at the object side and changeable between a first state, a spacing of the lenses is a predetermined spacing, and a second state, the spacing of the lenses is narrower than in the first state; a second lens unit that is disposed at the image side and capable of changing a focusing state by moving along the optical axis; a restricting member that restricts the change of the first lens unit from the first state to the second state; and driving unit that, in a state in which the change to the second state is restricted by the restricting member, moves the second lens unit toward the image side, wherein the restricting member releases the restriction in association with a completion of the movement of the second lens unit by the driving means.