The functional chair includes a backrest support, a backrest, a rotation axis, two rotation plates, an operation rod, a massage roller, and an armrest. The backrest is fixed to the backrest support and has a plurality of operation holes perforated at both sides of the front surface in a zigzag pattern, the rotation axis is fixed to a center of the rear surface of the backrest. The two rotation plates have multiple finger-like extensions formed at horizontally the same location as the operation holes and face while not interfering with each other so as to allow each of the finger-like extensions to rotate on the rotation axis through a rotation sleeve. The operation rod is fixed to the opposite side of each finger-like extension on each of the rotation sleeves and emerges to the front direction of the backrest through each operation hole when each rotation plate rotates.
