Future lepton colliders are now intensively discussed around the world, and we have so far four proposals of the colliders; one from Asia (ILC and CEPC) and the other from Europe (FCC-ee and CLIC). Main goal of the colliders at the first stage (s1/2 = 240-250 GeV) is to precisely measure known Higgs couplings to tackle the problem of the electroweak symmetry breaking. On the other hand, it is also interesting to discuss whether other new physics signals, in particular dark matter’s, can be detected or not. In this talk, after briefly addressing the current status of the ILC project in Japan, I would like to talk about how important roles future lepton colliderscan play to detect dark matter.

Shigeki Matsumoto is a theoretical physicist at Kavli IPMU (Kavli Institute for the Physics and Mathematics of the Universe) in the University of Tokyo. He received his Ph.D at Tohoku University in 2000. Collaborated with Junji Hisano and Mihoko Nojiri, he invented the Sommerfeld effect to dark matter physics. He recently works as a working group member of ILC’s Advisory Panel in Japanese government (MEXT) as well as a committee member of Japan Association of High Energy Physicists (JAHEP). His major interests are dark matter physics involving model buildings, collider searches, direct and indirect detections, cosmology, astrophysics of darkmatter.