A hinge plate for concealed placement between door frame and door panel, has two mounting bases that can be set into recesses in the door frame and in the door panel, and hinge brackets that work together in pairs, which are connected to rotate about a vertical axis of rotation. On the mounting bases, in each instance, the end of one hinge bracket is mounted to rotate about a vertical axis of rotation, and the end of the other hinge bracket is guided to move longitudinally. The hinge brackets are structured as connection elements having the same construction, which have a U shape with a connecting stay and vertically oriented shanks. The hinge brackets are joined together in the manner of a plug-in connection, and are connected to rotate at the connecting stays.