While QCD (quantum chromodynamics) has a long history, it has aroused endless theoretical interest, and new attempts and ideas are always advocated. Furthermore, it evolves continuously by actively incorporating advances in other areas of physics. We hold a QCD study group in order to share the information on the latest development in QCD. We take a longer time than ordinary seminars (~ 2 hours + discussion), and encourage the participants to ask questions without time constraint. It is held once a month either at RIKEN, the University of Tokyo (Hongo Campus) or Keio University (Hiyoshi Campus).