Disclosed is a driving posture adjusting apparatus comprising: a seat-position adjusting mechanism (2) adapted to move a seat cushion (1a) of a driver seat (1) in a longitudinal direction so as to adjust a longitudinal position of the driver seat (1); a seated-posture adjusting mechanism (3) adapted to adjust a seated posture of a driver seated in the driver seat (1); a controllability adjusting mechanism (7) adapted to adjust controllability for an operation section (4) to be operated by the driver; a seat slide switch (91) adapted to issue an instruction for actuating the seat-position adjusting mechanism (2) to move the seat cushion (1a) of the driver seat (1) in the longitudinal direction; and control unit (95) operable to actuate the seated-posture adjusting mechanism (3) and the controllability adjusting mechanism (7), in correlation with the longitudinal position of the driver seat (1) adjusted according to an input signal through the seat slide switch (91), so as to obtain a driving posture corresponding to a predetermined recommended position. The driving posture adjusting apparatus of the present invention can adjust a driving posture of a driver seated in a driver seat, in an easy and proper manner.