An image pickup apparatus includes a relative phase detecting unit operable to detect an amount of change in a relative phase associated with movement of a movable portion; an origin point position detecting unit operable to detect that the position of a reference part passes through an origin point; a relative position deriving unit operable to derive information on a relative position of the movable portion; a relative detection position retaining unit operable to retain a relative detection position of the movable portion based on the information on the relative position obtained at the time of the detection by the origin point position detecting unit; a calculating unit operable to calculate an absolute detection phase based on the relative detection position of the movable portion and to generate a drive signal based on the absolute detection phase; and a driving unit operable to move the movable portion to the reset position based on the drive signal.