The optical unit (1) includes a front frame portion (4) that holds the object-side fixed lens group, a rear frame portion (5) that holds the image-side fixed lens group or the image sensor, and the front frame portion (4) and the rear frame. A movable lens group is held between a fixed portion having a fixed portion main body (20) for holding the portion (5), an object side fixed lens group, and an image side fixed lens group or an image sensor, and a fixed portion main body (20 ) In the radial direction inside the movable portion slidably disposed with respect to the fixed portion main body (20), and magnetically polarized in a direction intersecting the optical axis of the object side fixed lens group disposed on the movable portion. It has a coil (11) which is arranged on the magnetic part and the fixed part main body (20) and is located on the radially outer side of the magnet, and the movable part is relative to the fixed part main body (20) along the direction of the optical axis. And a voice coil motor that can be moved, and the fixed body (20) Of a direction parallel to the largest dimension of the first direction is longer than the maximum dimension in a second direction perpendicular to the first direction and the direction of the optical axis.光学ユニット（１）は、物体側固定レンズ群を保持する前枠部（４）、像側固定レンズ群又は撮像素子を保持する後枠部（５）、並びに前枠部（４）及び後枠部（５）を保持する固定部本体（２０）を有する固定部と、物体側固定レンズ群と、像側固定レンズ群又は撮像素子との間で可動レンズ群を保持し、固定部本体（２０）の径方向内側に該固定部本体（２０）に対して摺動可能に配置される可動部と、可動部に配置されて物体側固定レンズ群の光軸と交差する方向に磁気分極された磁性部、及び固定部本体（２０）に配置されて磁石の径方向外側に位置するコイル（１１）を有し、可動部を光軸の方向に沿って固定部本体（２０）に対して相対移動させることが可能なボイスコイルモータと、を備え、固定部本体（２０）は、磁性部の磁化方向と平行な第１の方向の最大寸法が、第１の方向及び光軸の方向と直交する第２の方向の最大寸法と比して長い。
