Vehicle seat including a duct

1. A vehicle seat comprising:

a pad including an air passage formed therein, and a hole communicating with the air passage;

a duct connected to the hole and configured to connect a blower and the air passage; and

a holding member connected to the duct;

wherein the duct comprises a first tubular portion positioned in the hole, and a first an extending outward from the first tubular portion,

wherein the holding member comprises a second tubular portion connected to the first tubular portion, and a second flange extending outward from the second tubular portion,

wherein the first flange and the second flange hold the pad therebetween,

wherein the duct comprises a bellows which is extendable and contractable, and

wherein the bellows includes the first flange.

2. The vehicle seat according to claim 1 , wherein the first flange comprises an inclined surface that is inclined with respect to the first tubular portion.

3. The vehicle seat according to claim 1 , wherein the first tubular portion and the second tubular portion overlap one another between the first flange and the second flange.

4. The vehicle seat according to claim 1 , wherein the first tubular portion has a constant cross-sectional shape.

5. The vehicle seat according to claim 1 , wherein the first tubular portion is in contact with an inner surface of the hole.

6. The vehicle seat according to claim 1 , wherein the first flange includes a hollow space that communicates with the duct.

7. The vehicle seat according to claim 6 , wherein the holding member further comprises a third flange extending outward from the second tubular portion, the third flange being located at a position different from a position of the second flange, and

wherein the third flange is positioned in the hollow space.

8. The vehicle seat according to claim 1 , wherein the duct comprises a first duct, and a second duct fitted to the first duct,

wherein the first duct comprises a first annular engagement portion having a shape of a ridge or a groove extending around a whole perimeter of an outer peripheral surface of the first duct,

wherein the second duct comprises:

a second annular engagement portion having a shape of a groove or a ridge extending around a whole perimeter of an inner peripheral surface of the second duct and configured to engage with the first annular engagement portion; and

an engagement confirmation portion that is visually checkable to confirm engagement of the first annular engagement portion and the second annular engagement portion.

9. A vehicle seat comprising:

a pad including an air passage formed therein, and a hole communicating with the air passage;

a duct connected to the hole and configured to connect a blower and the air passage; and

a holding member connected to the duct;

wherein the duct comprises a first tubular portion positioned in the hole, and a first flange extending outward from the first tubular portion,

wherein the holding member comprises a second tubular portion connected to the first tubular portion, and a second flange extending outward from the second tubular portion,

wherein the first flange and the second flange hold the pad therebetween,

wherein the duct comprises a first duct, and a second duct fitted to the first duct,

wherein the first duct comprises a first annular engagement portion having a shape of a ridge or a groove extending around a whole perimeter of an outer peripheral surface of the first duct,

wherein the second duct comprises:

a second annular engagement portion having a shape of a groove or a ridge extending around a whole perimeter of an inner peripheral surface of the second duct and configured to engage with the first annular engagement portion; and

an engagement confirmation portion that is visually checkable to confirm engagement of the first annular engagement portion and the second annular engagement portion, and

wherein the second duct comprises a bellows that is extendable and contractable.

10. A vehicle seat comprising:

a pad including an air passage formed therein, and a hole communicating with the air passage;

a duct connected to the hole and configured to connect a blower and the air passage; and

a holding member connected to the duct;

wherein the duct comprises a first tubular portion positioned in the hole, and a first flange extending outward from the first tubular portion,

wherein the holding member comprises a second tubular portion connected to the first tubular portion, and a second flange extending outward from the second tubular portion,

wherein the first flange and the second flange hold the pad therebetween,

wherein the duct comprises a first duct, and a second duct fitted to the first duct,

wherein the first duct comprises a first annular engagement portion having a shape of a ridge or a groove extending around a whole perimeter of an outer peripheral surface of the first duct,

wherein the second duct comprises:

a second annular engagement portion having a shape of a groove or a ridge extending around a whole perimeter of an inner peripheral surface of the second duct and configured to engage with the first annular engagement portion; and

an engagement confirmation portion that is visually checkable to confirm engagement of the first annular engagement portion and the second annular engagement portion,

wherein the first annular engagement portion has a shape of a ridge formed by the outer peripheral surface protruding outward, and

wherein the second annular engagement portion has a shape of a groove formed by the inner peripheral surface depressed inward.

11. The vehicle seat according to claim 10 , wherein the engagement confirmation portion comprises an opening formed in the second duct.

12. The vehicle seat according to claim 11 , wherein the first duct comprises a protrusion that is positioned in the opening when the first annular engagement portion and the second annular engagement portion are engaged with each other, and

wherein the engagement confirmation portion includes the protrusion.

13. The vehicle seat according to claim 11 , wherein the second duct has a cross-sectional shape larger in a second direction than in a first direction, the second direction being orthogonal to the first direction, and

wherein the opening is formed in a side surface of the second duct extending along the second direction.

14. The vehicle seat according to claim 11 , wherein the opening is located closer, than the second annular engagement portion, to an extreme end of the second duct.

15. The vehicle seat according to claim 11 , wherein the opening is formed in a part of the second annular engagement portion.

16. The vehicle seat according to claim 10 , wherein the second duct comprises a bellows that is extendable and contractable.

17. The vehicle seat according to claim 10 , wherein the engagement confirmation portion is a marker formed on the first duct,

wherein the marker is located farther, than the first annular engagement portion, from an extreme end of the first duct, and is covered by the second duct when the first duct is fitted to the second duct.

18. The vehicle seat according to claim 17 , wherein when the first annular engagement portion and the second annular engagement portion are engaged with each other, a distance from the marker to an extreme end of the second duct is shorter than a distance from the marker to the first annular engagement portion.

19. The vehicle seat according to claim 10 , wherein the engagement confirmation portion comprises a window formed in the second duct, and a marker formed on the first duct, and

wherein when the first annular engagement portion and the second annular engagement portion are engaged with each other, the marker is located visually observable through the window.

20. The vehicle seat according to claim 10 , further comprising a seat frame including a pair of side frames, and a connecting member connecting the pair of side frames,

wherein a fitted portion of the first duct and the second duct faces the connecting member, and

wherein the engagement confirmation portion is formed on a surface that does not face the connecting member.