Abstract: An automotive vehicle seat adjusting system according to this invention is constructed to move a seat by a drive circuit. It is also constructed to allow a driver to change, during movement of the seat, the moving speed of the seat as he likes. In the system of this invention, when a signal indicative of the feeling of the driver to the moving speed of the seat is inputted, fuzzy inference is performed in accordance with a speed decision rule to decide an optimal moving speed. The optimal moving speed is decided by a fuzzy inference processor on the basis of the inputted feeling signal and an actual moving speed. The drive circuit is controlled in accordance with the decision at the fuzzy inference processor, whereby the seat is allowed to move at the optimal moving speed.