Cosmic dark matter problem is now regarded as one of the most important topics in many fields of physics. Particle physicists expect that clarifying its microscopic nature will give a clue to physics beyond the standard model, while astrophysicists consider that the nature is deeply related to the structure of our universe. Moreover, the detection of dark matter attracts physicists in other fields such as nuclear, atomic, condensed matter, and even chemical physics, as it gives interesting motivation to develop new materials in their fields. Since the dark matter mass is currently predicted to be in a range between 10^-55 g and 10^40 g; namely there is uncertainty of a hundred orders of magnitude, a certain diversity of research is required to solve the dark matter problem. Interestingly, such a research is very active at Kavli IPMU and it induces various interdisciplinary studies among the fields mentioned above. I would like to introduce these studies in this colloquium without sticking to too much technical details.