An article of outdoor foldable furniture with a lamplight decoration structure includes a frame body and a foldable component for connecting the frame body. The frame body is provided with at least one light bar groove. The foldable component includes a first connecting part, a folding part, and a second connecting part. The first and second connecting parts are closed and extended through the folding part. The first connecting part and/or the second connecting part are provided with a luminous body mounting groove. The luminous body mounting groove is correspondingly disposed in the light bar groove of the frame body. A lampshade, provided with a light guide bar, is mounted in the light bar groove of the frame body. A light-emitting unit corresponding to the light guide bar is mounted in the luminous body mounting groove. A controller is conductively connected to the light-emitting unit through flexible wires.

A folding chair armrest locking device and a folding chair are introduced to enhance user safety of the folding chair. The folding chair armrest locking device includes a casing having therein a storage and an armrest fitting portion in communication with the storage; a rack having an armrest coupling portion and a first dentate portion and being partially disposed in the armrest fitting portion, with the first dentate portion partially facing the storage; and a locking module having a locking element, a wrench and a resilient component, the locking element having a first end with a second dentate portion, the second dentate portion being disposed in the storage and facing the first dentate portion, the wrench having a pivotal connection portion eccentrically positioned and pivotally connected to a second end of the locking element, and the resilient component being disposed in the storage and resiliently supporting the locking element.