An Expert Database on the Earth Impact Structures (EDEIS) has been compiled and is being maintained in the Tsunami Laboratory of the Institute of Computational Mathematics and Mathematical Geophysics of SD RAS in Novosibirsk. This database is somewhat more liberal than the well-known Earth Impact Database maintained by the Planetary and Space Science Centre, University of New Brunswick, Canada. In addition to including the fully validated impact structures, the EDEIS also lists proposed structures whose impact genesis still needs validation. For any structure, the degree of confidence of impact origin is reflected by its validity index V, which varies from 4 (confirmed) to 0 (rejected) with intermediate values of 3 (probable), 2 (perspective) and 1 (proposed for further study). Classification of structures over the validity index is based on some sort of expert judgment and reflects the availability of impact criteria found at four different levels - morphological, geological, petrological, and mineralogical. Currently, the database contains 1020 structures, among them 214 with V = 4, 211 with V = 3, 455 with V = 2, and 47 with V = 1. 93 structures have validity index V = 0, because the once proposed impact origin was later disproved by additional studies.