Abstract: A door opening and closing apparatus which enables the opening and closing of a door in either direction as desired, and includes hinge shafts which are installed on the left and right sides of a main body to which the door is affixed, left-hand and right-hand hinge accommodation members having shaft receptacles for accommodating the hinge shafts so as to allow the hinge shafts to enter and exit via passages in the accommodation members, and cam plates for mutually interlocking the hinge accommodation members and a connection member for connecting the cam plates with each other, so that when on hinge shaft is released from one hinge accommodation member binds the other hinge shaft.