In 2015, a black hole binary was confirmed by gravitational waves, and since it was pointed out that this may be a binary of primordial black holes, many researchers, not only in cosmology and gravity theory, but also in elementary particles and astrophysics, have come to realize utility of primordial black holes. As a result, primordial black hole research has rapidly developed and expanded in the last 10 years. The motivation for organizing this workshop is to take this opportunity to promote international mutual understanding, build cooperative relationships, and lead to future constructive and cutting-edge international joint research. 

This workshop invites researchers who are conducting cutting-edge research on various aspects of primordial black holes, and provides a forum for intensive discussion, allowing researchers to interact with each other at a depth.