The Quantum Chemistry Literature DataBase (QCLDB) is a database of those papers published after 1978 which treat ab initio calculations of atomic and molecular electronic structure. From about thirty core journals they are collected, surveyed, and given proper tags revealing the content and essence of the paper by the group of young Japanese quantum chemists. Those theoretical works even without reporting any computational results are also collected which are judged to have significant relevance to ab initio calculations, while no semi-empirical calculations are included. QCLDB is finally edited and copyrighted by Quantum Chemistry DataBase Group (QCDBG).