SEAT COVER STRUCTURE OF SEAT CUSHION CAPABLE OF CHANGING LENGTH

PROBLEM TO BE SOLVED: To provide a seat cover structure capable of corresponding to changes of a length of a seat cushion without relying on the expansibility of a material of a seat cover in a seat capable of changing a length of the seat cushion. SOLUTION: This is a structure of a seat cover which is provided with a length variable device changing a length of a seat cushion by elastically displacing a bent front part 14a in the forward and backward directions through an operation roller 18 arranged on an inner side of the bent front part of a cushion pad 14 and covers the seat cushion. In this case, the seat cover consists of a side cover member 26 covering an upper face and a side face of the cushion pad and a main seat cover member 35 in which a rear end side is connected at a width position of a predetermined front and rear section of the upper face of the side cover member and is overlapped on the side cover member and a front end side is arranged on a lower face along the bent front part of the cushion pad. The front end side of the main seat cover member is connected with the length variable device through an expandable belt member 38.