"The Metrology Institute of Japan (MIJ)" and "the Metrology Management Center" both of which are part of the National Institute of Advanced Industrial Science and Technology (AIST), together make up the National Metrology Institute of Japan (NMIJ). Those two equally important NMIJ organizations cooperate with each other for NMIJ to function as a single institution in charge of measurement standards.

We at NMIJ devote ourselves to various tasks in order to facilitate development of Japanese economic activities in the international market. We form consistent policies concerning measurement standards and legal metrology. We also conduct research and development activities of measurement standards. Moreover, we provide metrological services such as testing and inspections of measuring instruments as well as metrological training. In doing so, we do out best to fulfill our responsibility of representing Japan in international activities regarding measurement standards and legal metrology, under the Meter Convention and the International Organization of Legal Metrology (OIML) Convention.