Conveyance system and storage unit

The object is to provide a transport system that enables an operator to easily access and perform maintenance work on an overhead transport vehicle, a grid-patterned rail, and an article, at the article storage suspended from the grid-patterned rail. A transport system includes: a grid-patterned rail that has a plurality of first rails extending in a first direction and a plurality of second rails extending in a second direction different from the first direction and intersecting with the first rails and that forms a plurality of cells with the plurality of first rails and the plurality of second rails; an overhead transport vehicle that travels along the grid-patterned rail, a suspender that is suspended from the grid-patterned rail; and a frame surrounding one of the cells in a plan view and is provided below the suspender. A placement section onto which an article is placed by the overhead transport vehicle and a scaffold serving as walkway on which an operator can walk are provided below the cells within the frame.