While the invention is easy to open and close the door not sealing the clearance between the door and the body is excellent, and to be made more comfortable viewing by removing obstacles such as viewing handles, door to door is not shaken about a relic exhibition showcases sealed so talk to the stability of the installation, the configuration is the body having an open front side and, and a door of a transparent material which is provided on the front side at the opening of the main body; And movably supported by the lower side of the door in the forward and lateral direction of the door opening and closing device to open and close the door body; consists of, the door opening and closing device, the main body is installed at one side of the door body and the door and a first support for supporting movably in the forward and lateral direction of the; the body and to the other Article 1 support and the door is provided to correspond with the second support for supporting movably in the forward and lateral direction of the door main body; Is provided between the first support and the second support to the third support portion movably supporting the door in the forward and lateral direction of the body; is composed of ; 展开▼