Patent ID: 6843259

Claim:
A solution treatment unit for supplying a treatment solution to a substrate to treat the substrate, comprising: a treatment container; an inner container provided in the treatment container and configured to surround an outer periphery of the horizontally held substrate, the upper and lower faces of the inner container being open; an exhaust pipe configured to exhaust an atmosphere in the treatment container, the exhaust pipe being provided in a bottom portion of the treatment container and inside the inner container, and an exhaust port of the exhaust pipe being open at a position higher than the bottom portion; and a drain port configured to drain the treatment solution in the treatment container and provided in the bottom portion, wherein an upper face of the bottom portion is inclined, wherein the drain port is provided at the lowest position of the inclined upper face, and wherein a supply member for supplying a cleaning solution to the bottom portion of the treatment container is provided at the highest position of the upper face of the inclined bottom portion.