Depressaria basicostata is a moth of the Depressariidae family. It is found in Japan. The wingspan is about 10 mm. The forewings are medium-grey, with a light grey patch at the extreme base, bordered on the outside by a narrow black band. The basal patch is continuous with a light-grey costal streak. The arc of this light-grey streak is bounded on the outside by a black, arched band composed of short black horizontal streaks. There is an arc of black spots at the termen and a white spot at two-thirds from the base in the centre of the cell, bounded on the termen side by a semicircular black line. There are also two black dashes at one third at the basal angle of the cell and a black dash halfway, just under the costal band. The hindwings are grey, darker around the edge.