Device for adjusting seat of vehicle

A device for adjusting a seat of a vehicle, comprising:

• a support link mounted with a first hinge on a floor panel;
• a first actuator connected between the support link and a front lower surface of a seat cushion frame, the first actuator including a first cylinder body, a first piston built in the first cylinder body to be movable back and forth, and a first motor mounted at the first cylinder body to provide a forward and backward driving force to the first piston;
• a second actuator connected between the floor panel and the first actuator;
• a third actuator connected between a rear lower surface of the seat cushion frame and the floor panel;
• and
• a controller selectively controlling driving of at least one of the first to third actuators in order to carry out at least one of a front and rear position adjustment, an up-and-down height adjustment and tilting of the seat,
• wherein the second actuator includes a second cylinder body, a second piston built in the second cylinder body to be movable back and forth, and a second motor mounted at the second cylinder body to provide a forward and backward driving force to the second piston, and
• wherein a lower portion of the second cylinder body is fastened with a second hinge to the floor panel, and the second piston is fastened with a third hinge to the first cylinder body of the first actuator.