Disclosed is a functional chair capable of adjusting a height of a seat. The functional chair includes a first seat configured to support a left pelvis, a second seat provided at a right side of the first seat, a frame provided below the first seat and the second seat, a backrest protruding from one side of the first and second seats, a seat pressure measuring unit which is respectively provided on the first seat and the second seat, a controller which receives the first pressure value and the second pressure value from the seat pressure measuring unit, a memory which stores in advance drive command information corresponding to a difference between the first pressure value and the second pressure value, a first height adjusting unit provided between the first seat and the frame, and a second height adjusting unit provided between the second seat and the frame.