Abstract: Provided is a vehicle seat ordering system that allows to design a custom-made seat suitable for a driving environment of a vehicle. One aspect of the present disclosure is a vehicle seat ordering system including: a seat for measurement, the seat including a seat body configured to be installed in a vehicle, and a sensor configured to detect a posture of an occupant of the seat body while the vehicle is running; and a seat design device configured to design a custom-made seat to be installed in the vehicle based on chronological data of the posture of the occupant obtained from the sensor.

Abstract: A double folding mechanism of a seat of a vehicle can fold a seat cushion from a space on a floor and fold a seat back into the space, thereby changing the seat from its use condition to its retracted condition. The double folding mechanism can include a first connecting mechanism connecting the seat cushion and the floor and a second connecting mechanism connecting the seat back and the floor. The second connecting mechanism can control the rotational speed of the seat back such that the seat back can enter inside a rotational trajectory of a rear end of the seat cushion after the seat cushion comes out of a rotational trajectory of an upper end portion of the seat back. The double folding mechanism can change the seat from the use condition to the retracted condition in one operation.

Abstract: A double folding mechanism of a seat of a vehicle can fold a seat cushion from a space on a floor and fold a seat back into the space, thereby changing the seat from its use condition to its retracted condition. The double folding mechanism can include a first connecting mechanism connecting the seat cushion and the floor and a second connecting mechanism connecting the seat back and the floor. The second connecting mechanism can control the rotational speed of the seat back such that the seat back can enter inside a rotational trajectory of a rear end of the seat cushion after the seat cushion comes out of a rotational trajectory of an upper end portion of the seat back. The double folding mechanism can change the seat from the use condition to the retracted condition in one operation.