Increasing number of museum in Japan is still continuous, although the ratio became slow. However, openings or preparations of big sizes of public museums, in particular of those of natural science such as of eco-system, globes science and paleont이ogy ， is conspicuous. Almost of these are a result of renovation or reorganization of old museums, opened in two or three decades ago , to enlarge the activities and to introduce modern high technology into the displays. Adding this , these museums have found many difficulties to insufficient space and old facilities correspond to the collection increased. Most of them were