Vertical series sediment traps were deployed at two stations, and time series sediment traps were moored 10 m above the seafloor at three stations at the mouth of Tokyo Bay. Al, K, Mg, Mn, Si, Ca, P and organic N were determined in settling particles and surface sediments near the trap sites. Lithogenic aluminosilicate material formed over 50% of the settling particles at all stations. Total mass fluxes observed with vertical series sediment traps were 3-75 g/m 2 day. Fluxes of Al and Mn increased with depth, and the Mn/Al ratio of settling particles collected at mid-depth showed a maximum due to the addition of reduced Mn diffused out from sediment of shallower depth. The flux of reduced Mn from the shelf edge of Tokyo Bay was calculated to be 18 mg/m 2 day. Temporal variations of Al and Mn fluxes revealed that lithogenic particles were transported above the bottom shelf edge of the mouth of Tokyo Bay to the open ocean.