To provide a seat cover for vehicle which is made hardly slip from a seat by using one kind of seat member and is hardly broken at acting points on the lower ends of right and left side parts of a bag part by external force.

A seat material is a composite sheet made by laminating a synthetic resin non-woven fabric sheet and a waterproof film. The composite sheet 1 having a vertically long oblong shape is formed by folding back the upper end part 2 to the non-woven fabric side and overlapping it on a non-folded-back part. Right and left side parts of the overlapping part of the folded-back upper end part 2 and the non-folded-back part are respectively jointed to form a bag part 8. Upon jointing, right and left side parts 7 and lower side parts 10 of the non-folded-back overlapping part are respectively folded to the folded-back upper end part 2 side and the non-woven fabric sheet side to joint the right and left side parts 7 of the non-folded-back overlapping part respectively to the folded-back upper end part 2. The bag part 8 is covered on the upper end part of the backrest of the seat. The non-bag part of the complex sheet 1 is overlapped on the backrest face ad the seat face placing the waterproof face to the seating person side and the nonwoven fabric sheet face to the seat side.