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What is the universe made of? This is one of the fundamental questions for humans. Elementary particle physicists including me aim to understand it. Dark matter is one of the main components of the universe. By cosmic observations, it has been found that dark matter exists around us and constitutes about a quarter of the energy of the whole universe. However, we don’t know several aspects about dark matter: how large its mass is and how we can detect it around us (how it interacts with the matters). I’m trying to understand such unknown aspects by detecting dark matter on the earth. In my previous career, I have involved in the development of a radio telescope. Taking advantage of the radio-wave (millimeter-wave) techniques, I’m trying a new experimental approach to the detection of dark matter. Conventional dark matter experiments have searched for dark matter with a relatively heavy mass. On the other hand, my approach by using the millimeter waves allows us to investigate a very light mass range. I aim to search for the wide unexplored mass range of dark matter under the Hakubi project.