Mat mounting structure in seat back and vehicle seat

A mat mounting structure for mounting a mat on a seat back frame in a seat back, comprising:

• a guide wire attachable to the mat configured to receive a force from a back of an occupant on the seat back, the guide wire comprising a straight part extending linearly in a longitudinal direction of the seat back frame on a head part or a root part of the seat back frame;
• a bushing comprising a penetration hole in which the straight part is insertable in the longitudinal direction;
• and
• an attachment hole part in the seat back frame, the bushing being detachably engageable with and attachable to the attachment hole part,
• wherein the attachment hole part comprises a first hole part and a second hole part, and the bushing comprises a first engagement part engageable with the first hole part and a second engagement part engageable with the second hole part, and
• the first engagement part is configured to pass through the first hole part by a rotation, and the second engagement part is engageable with the second hole part as well as the first engagement part is engageable with the first hole part by a linear movement after the rotation.