Conveyance seat manufacturing method and conveyance seat

A method for manufacturing a conveyance seat, the method comprising:

• preparing a cushion material divided into a first cushion material piece having a support portion supporting a seated person's buttocks and a second cushion material piece having an intersecting portion intersecting with the support portion at a position next to the support portion, a recessed portion being formed at a boundary position between the support portion and the intersecting portion in the cushion material;
• preparing a skin material having an overlapping part configured by two skin material fragments overlapping each other;
• covering the cushion material by the skin material such that the overlapping part is inserted into the recessed portion;
• and
• forming the overlapping part inserted into the recessed portion such that each of the two skin material fragments constituting the overlapping part has a first part and a second part, the first parts satisfying the following condition (1) and the second parts satisfying the following condition (2):
• (1) the respective first parts of the two skin material fragments being welded to be in contact with each other on a back side of the recessed portion behind an opening of the recessed portion and parts of the respective first parts of the two skin material fragments being crushed,
• (2) the respective second parts in the two skin material fragments being adjacent to the first parts at positions closer to the opening of the recessed portion than the first parts and the second parts being separated from each other such that a gap between the second parts decreases as the first part is approached, wherein
• the overlapping part inserted into the recessed portion extends along a width direction of the conveyance seat,
• a linear member for hanging the overlapping part is attached to the overlapping part inserted into the recessed portion,
• the overlapping part inserted into the recessed portion is wrapped in a tarpaulin, the tarpaulin having the same length as the overlapping part inserted into the recessed portion in the width direction and comprising a hole for passing the linear member,
• the linear member has an annular shape, and
• an end of the linear member on a seating surface side of the conveyance seat is wrapped in the tarpaulin.