METHOD OF MANUFACTURING CUSHION FOR FRONT PASSENGER SEAT AIR BAG DEVICE

A cushion of a passenger airbag device that is reduced in volume and shows a stable behavior when inflated and deployed is achieved. The present invention is a method of producing a cushion (10) of a passenger airbag device (1) having a portion with a desired curvature by sewing side edges of base fabric pieces constituting a main panel (12) and left and right side panels (14) together. The main panel (12) and the side panels (14) are sewn together so as to form a rectangular opening, whose short sides have a length equal to the width of the side panels (14) and whose long sides have a length equal to the width of the main panel (12), at a position where stitches in the main panel (12) and side panels (14) start or end. Then, the portion with a desired curvature is formed by folding the short sides toward the opening and sewing the short sides and the long sides together.