Disclosed herein are mammography device for X-ray photographing a breast and a method of photographing an object to be inspected using the same. The mammography device includes: a generator irradiating an X-ray； a detector facing the generator； a pressing pad moving between the generator and the detector to press an object to be inspected； a biological index deciding unit deciding a biological index of a subject； and a controller controlling a movement distance and a velocity of the pressing pad on the basis of the biological index decided in the biological index deciding unit.
