Our knowledge of the quark-mixing matrix and of CP violation has been tremendously improved thanks to the B factories (BABAR and Belle experiments) and Tevatron: the KM mechanism is the dominant source of CP violation. LHCb is one of the six experiments being constructed on the Large Hadron Collider accelerator at CERN. It is a next generation of flavor-physics experiments which will perform precision tests of CP violation and study rare phenomena to unveil physics beyond the Standard Model, if any, in the interactions of charm- and beauty-hadron decays. The current build status of the detector will be given followed by a review of the predicted physics reach for the first year of running.