Miniature driving device for digital camera with focusing driving motor

A micro mode executing apparatus of a digital still camera has an image sensor and a focus controlling lens connected to a focus driving motor and a spindle of the motor, thereby controlling an optical length within the range of a fixed barrel structure. The micro mode executing apparatus a motor that moves along a rotating axis of the spindle with a rotating direction of the motor being changed in accordance with an applied electrical signal. An image sensory is mounted integrally onto one side of the motor through a fixing member and acts to convert an image of an object to an electrical signal. A focus lens is positioned on the same optical axis as the image sensor and is secured to one end of the rotating axis of the spindle. A housing consisting of a first step region for limiting a transferring area of the motor and a second step region for limiting a transferring area of the focus lens, wherein the first and second step regions form a barrel structure having a step layer. A first biasing member is connected to the focus lens and the motor, and has a constant biasing force; and a second biasing member is provided for positioning the motor on the first step region for applying a biasing force in a lateral direction.