A pelvis remedial seating device is provided having a seat including a seat cushion on which an occupant is to be seated and left/right seat sides provided uprightly at each side end of the seat cushion; a pair of air bags nested to a height of the pelvis portion of an occupant on an inner side of each side for enabling themselves to be expanded or contracted by air supplied into or discharged from the inside of the air bag; air injector for providing air pressure to the air bags; and a controller for controlling running time, level, and direction of air flow supplied through the air injection means, wherein the expanding air pressure in the air bags presses the pelvis portion of an occupant.