Abstract: A combination tool caddy and stool comprises a base, having a pedestal-type seat mounted on a central portion of the base. A vertical support post is mounted on a marginal portion of the base in a laterally spaced apart relationship with the seat. A tray is supported on the vertical post in a horizontal orientation by an adjustable coupling which permits the tray to be moved vertically and horizontally to a location that is conveniently reachable by a user seated on the seat. The tray can also be mounted on the support post in a vertical orientation to form a backrest for the seat. The seat and the tray are preferably attached to the base by interchangeable coupling members, so that the seat can be removed, and the tray supported on the center of the base to provide additional stability. Wheels may be provided on the base so that the unit can be manually propelled by a seated user from one work site to another.