Folding mechanism and foldable chair with the same

A foldable chair comprising:

• a pivot seat unit including at least three pivot pins that are angularly spaced apart from each other about an axial line, and a connecting member, each of said pivot pins having a central line;
• at least three support units disposed about the axial line, each of said support units including a support rod that has an extending axis, and a push member that is fixedly connected to said support rod, said support rod of each of said support units having a first end portion, a second end portion that is opposite to said first end portion along the extending axis, and a pivot portion that is located between said first end portion and said second end portion and that is pivotally connected to a respective one of said pivot pins, said push member of each of said support units being located between said pivot portion and said second end portion of said support rod of said support unit, and having first and second push surfaces, said support units being convertible between a folded state, in which said first end portions of said support rods of said support units are proximate to the axial line, said second end portions of said support rods of said support units are proximate to the axial line, said first push surface of each of said push members of said support units faces said second push surface of an adjacent one of said push members, and said second push surface of each of said push members faces said first push surface of the other adjacent one of said push members, and an unfolded state, in which said first end portions of said support rods of said support units are distal from the axial line, and said second end portions of said support rods of said support units are distal from the axial line, rotation of any one of said support rods of said support units relative to said pivot seat unit drives a circumferentially adjacent one of said support rods to rotate, such that when any one of said support rods is rotated relative to said pivot seat unit about the central line of the respective one of said pivot pins, the others of said support rods are in turn driven to rotate relative to said pivot seat unit so as to convert said support units between the folded state and the unfolded state;
• and
• a sitting unit including a sitting set that is connected to said support rod of one of said support units, and a linkage set that is connected to said connecting member of said pivot seat unit and that is for being driven by said sitting set, said sitting set being operable to drive said linkage set so as to rotate said support rod of the one of said support units and said pivot seat unit relative to each other, and to convert said support units between the folded state and the unfolded state.