A collapsible highchair for an infant has a seat (3), a back-rest (4) and a front leg-support (5) that are provided in one by an elongate, contoured moulding (1). Rear leg-support is by tubular legs (2) which are pivoted to the one-piece moulding (1) under the seat (3) and which are held in rearward extension in the erect condition of the highchair by a pivoted tubular frame (10) which snaps into a socket (11) under the seat (3). Release of the frame (10) from the socket (11) allows the legs (2) to fold onto the underside of the front leg-support (5) for collapse of the chair. A tube (14) attached at each end under the seat (3) extends up either side of the seat (3) to form arm-rests (15), and a backwardly/forwardly slidable tray (18) is attached by releasable mounts (20) to the arm-rests (15).