The subject innovation is the miniaturization and design of the inner body by relates to a double lock device with the open-lock button, integration of the double locking device for the open-lock button and to prevent the sseomteon rotates to block the intrusion of the outside of the non-drawn It relates to a double lock device with a lock button to open for easy. The present design for this is, with a protrusion coupled to the hub to interface with the dead bolt formed key tail coupled sseomteon and, coupled to the key tail projection of the sseomteon is moved up and down by the bushing and a rotary groove formed in the outer circumference of the wherein the open-lock button provided on the inner side of the double-lock the protrusion coupled to the groove is formed with a double locking device to prevent rotation of the sseomteon, and according to a known having open lock pad for interlocking the sseomteon, It is characterized in that an integrally. Thus, the subject innovation is to reduce the size of the inner body by reducing the space they occupy in the open integration of the lock button and the double locking device, so that it is easy to design effective to design the inner body.