The objective of this paper is to make clear the fundamental situations of museums in Japan from the viewpoints of operations and facilities. The contents of this paper are as follows. 1. Introduction. 2. Outline of the investigations. 3. Ownership, first year of operation and location. 4. Service time. 5. Scale of the floor area. 6, Number of staff. 7. Evaluation of the present conditions with the Standard Codes. 8. Contents of the staff duties. 9. Conclusion.