Abstract: A collapsible working chair including a flat base equipped with swivel wheels for moving on the ground, the flat base having a recessed top side divided by a partition plate into a front open chamber for keeping tools and tool accessories, and a rear open chamber for receiving a seat, and two pairs of mounts symmetrically fixedly mounted in the rear open chamber; a seat supported on the flat base; and two pairs of folding collapsible supports connected between the mounts of the flat base and the seat, and set between the working position to support the seat above the flat base and the collapsed position to receive the seat within the rear open chamber of the flat base.