An optical disk apparatus for enabling to insert a multi-layered optical disk therein, which has plural numbers of re-writable recording layers, comprising: a spindle motor 42; an optical pickup 2; and a system controller 100 for controlling the optical pickup to move into a radial direction of the optical disk, as well as, for controlling the optical pickup so that a light-beam irradiated therefrom is focused upon either one of the plural numbers of recording layers of the optical disk, wherein when it is determined that the target layer to be accessed lies on a layer different from that, upon which the optical pickup focuses the light-beam at present, the light-beam irradiated from the optical pickup is shifted to the target layer, after being moved into a radial direction of said optical disk on the layer, upon which the light-beam irradiated therefrom is focused at present, up to an information recording area where the information of the target layer is recoded.