LHCb is a dedicated experiment to study CP violation and other rare processes in the B meson system at LHC. It is designed to exploit the large sample of Bd and Bs mesons available at LHC by having a trigger system efficient for both leptonic and hadronic final states, particle identification capability over large momentum range and excellent decay time resolution. Recently, the detector has been reoptimized in order to reduce the material budget and to improve the trigger performance. Construction of various detector components is well advancing and the experiment is expected to be ready for data taking from the beginning of the LHC operation. PACS: 25.70.Ef – 21.60.Gx – 27.30.+t