Abstract: A chair includes a seat frame, a pair of rear joint unit, a backrest frame, a pair of rear legs, a pair of front joint units, and a pair of front legs. The seat frame has a top side, a bottom side, front and rear ends, and two lateral sides which interconnect the front and rear ends. Each of the rear joint units has a first pivot member disposed above the seat to extend along a direction transverse to the lateral sides of the seat frame, and a second pivot member disposed below the seat frame to extend parallel to the first pivot member. The backrest frame is connected pivotally to the rear joint units via the first pivot members so as to be foldable over the top side of the seat frame. Each of the rear legs is connected pivotally to one of the rear joint units via the second pivot member so as to be foldable over the bottom side of the seat frame. Each of the front joint units has a third pivot member parallel to the second pivot member.