TECHNICAL FIELD

The present invention relates to a seat.

BACKGROUND ART

It has been conventionally known that, for example, as disclosed in Patent Literature 1, a vehicle seat includes a seat cushion unit composed of: a seat cushion frame; a seat pad (a cushion material) lying thereon; and a trim (a surface cover) which covers the seat pad.

In the seat cushion unit, the trim has a periphery (an end portion) extending to a backside of the seat cushion frame and fastened thereto. In this way, the trim tightly covers the seat pad.

The seat cushion unit can have bulge parts respectively on left and right sides of a sifting part which receives buttocks of an occupant for supporting the buttocks from left and right sides thereof. In this case, the trim is pulled into the seat pad side along a boundary between the sitting part and each of the bulge parts, thereby tightly covering the seat pad without any gap against the seat pad.

Meanwhile, the sitting part of the seat cushion unit in such a vehicle seat may have an intended uneven surface from the viewpoints of improved comfortability and designability. For instance, the trim is pulled widthwise into the seat pad side at a plurality of positions of a specific part of the trim that corresponds to the sitting part in a front-rear direction thereof. The pull-in action achieves the uneven surface of the sitting part.

However, there is a possibility that a crease occurs in the trim at the rear of the bulge part after the pull-in action is executed widthwise in a rear portion of the sitting part in the aforementioned manner. Specifically, as the vehicle seat is assembled with a reclining mechanism, the bulge part normally has a smaller width at the rear of the seat cushion unit than at the front thereof, and has a weaker repulsive force of the seat pad than the remaining parts. For this reason, the pull-in action executed widthwise in the rear portion of the sitting part in the aforementioned manner may cause, in the trim, creases extending from the longitudinally opposite ends of a pull-in section formed by the pull-in action at the rears of the bulge parts, resulting in poor appearance.

CITATION LIST

Patent Literature

Patent Literature 1: Japanese Patent Application Laid-Open No. 2017-190035

SUMMARY OF INVENTION

The present invention has been accomplished in view of the aforementioned drawback, and has an object to provide a technology of suppressing an occurrence of a crease in a trim at the rear of a bulge part of a seat cushion unit.

A seat according to the present invention has a seat cushion unit including: a seat cushion frame; a seat pad which lies over the seat cushion frame; and a trim which covers the seat pad. The trim includes: a trim main body which mainly covers a top surface of the seat pad; a first trim joiner which extends from the trim main body to a backside of the seat cushion frame at the rear of the scat pad, and is fastened to the seat cushion frame; and a second trim joiner which is connected to a back surface of the trim main body in at least one of left and right end regions of the rear of the seat cushion unit, extends to the backside of the seat cushion frame at the rear of the seat pad, and is fastened to the seat cushion frame.

