A camera module and an auto focusing method of the camera module are provided, the camera module including a VCM (Voice Coil Motor) including a rotor including a lens distanced from a reference plane, in a case no driving signal is applied, a posture detection sensor determining a posture of the VCM; an ISP (Image Signal Processor) generating a driving signal for driving the VCM using an optimum focus value of the lens calculated by an auto focus algorithm in response to a posture of the VCM determined by the posture detection sensor, an image sensor changing lens-passed light to a digital signal, and a controller controlling the VCM, the posture detection sensor, the image signal processor and the image sensor.