Seat

1. A seat comprising: a seat member that includes a cushioning material; and a fastening member that allows a trim cover to be detachably attached to a predetermined position on the seat member; wherein:

the fastening member is constituted by a slide fastener that includes: a fastener part constituted by one fastener half and another fastener half; and a slider part that slides along the fastener part so as to open and close the one fastener half and the other fastener half;

at least part of a base part provided in the one fastener half is embedded in the cushioning material;

part of the other fastener half is fixed to the trim cover;

the one fastener half is accommodated in a drag-in groove;

at least part of the base part has a width larger than a thickness of the one fastener half in a thickness direction of the one fastener half; and

the base part is provided with a projection that extends in the depth direction of the drag-in groove.

2. The seat according to claim 1 , wherein the base part is formed in a platy shape.

3. The seat according to claim 1 , wherein a slit is provided on a lateral portion of the base part.

4. The seat according to claim 1 , wherein the ends of the base part are projected with respect to ends of the fastening member in a longitudinal direction of the fastening member.

5. The seat according to claim 2 , wherein a slit is provided on a lateral portion of the base part.

6. The seat according to claim 2 , wherein the ends of the base part are projected with respect to ends of the fastening member in a longitudinal direction of the fastening member.

7. The seat according to claim 1 , wherein the projection is disposed on a lower surface of the base part.