Abstract: A disposable umbrella having an elongated handle member for supporting a foldable canopy. A plurality of rib members are positionable along the underside of the canopy. A collar member is slidable along the handle and is registrable with a cam surface on the rib members for urging the rib members to open the canopy. The collar member is press-fit into friction-locking engagement with the rib members to releasably retain the canopy in the open position. The collar member, the plurality of rib members and the canopy are assembled on the handle member and secured by an end cap that is lockingly engageable with the handle member.