Arranging an application apparatus, an exposure apparatus, a developing apparatus, and similar apparatus together within a large yellow room makes it difficult to change a layout in association with a change of a recipe and to streamline a layout area and similar parameter. A yellow room system includes: a plurality of portable unit process apparatuses 50 that each have the same standardized outer shape and include a yellow room configured to shield a exposure light to a photosensitive material formed on a workpiece; conveyance containers 11 and 25 that convey the workpiece between the unit process apparatuses and itself is formed as the yellow room; and a light-shielding coupling structure that couples the unit process apparatus, which is formed on a docking port 56 disposed in the upper portion of a front chamber 80 of the unit process apparatus 50, and the conveyance containers together.