A seat adjustment apparatus for mobility includes a seat cushion, wherein, during seat cushion tilting, the front portion of the seat cushion is moved upwards, and the rear portion thereof is moved downwards so that the occupant's lower body is not moved upwards as a whole, and the occupant's feet are not excessively lifted. Accordingly, there is no need for a separate footrest for supporting the occupant's feet, and seating convenience is improved by implementing a stable occupant posture. Furthermore, a tilting bar provided for seat cushion tilting supports a seat frame so that the posture of the occupant's lower body does not collapse due to deformation of the seat cushion during a collision, securing the occupant's stability.