The LHCb Experiment at CERN =========================== T.Nakada (CERN) Abstract -------- The LHCb experiment is designed to make a thorough study of CP violation and other rare phenomena in the B-meson systems. It can fully exploit the large number of B-mesons produced at LHC from the beginning of the LHC operation. After exploring the physics justification of the experiment, some important aspects of the detector design will be discussed.