Disclosed herein is a digital mammography device. The digital mammography device comprises a pressure pad configured to be movably installed between an X-ray generator for irradiating X-rays and a detector for receiving X-rays that have passed through an object to be imaged, in such a way as to apply pressure to the object to be imaged; a pressure pad driving part configured to include a motor and a power transferring part for moving the pressure pad by means of the power of the motor, and an applied pressure transferring part configured to include a coupling block to which the pressure pad is fixed to the power transferring part and relatively and movably connected to the coupling block, and provides an electrical signal depending on a relative movement displacement between the coupling block and the mobile block.