A portable device including a body, a panel display, a touch sensor, and a positioning determining element is provided. The panel display and the touch sensor are disposed at a first surface and a second surface opposite to the first surface of the body. The positioning determining element is disposed in the body for determining the locations of each finger when the body is hold and defining a conformal keyboard corresponding to the shape of hands, so the user can execute programs via the finger actions on the touch sensor conveniently.