A cover material for a vehicle seat sheet is provided. The cover material for a vehicle seat sheet includes a first fabric, a second fabric, and a decorative piping member. The decorative piping member includes an approximately rectangular seam margin part, a tubular part connected to a widthwise end part of the seam margin part, and a core part arranged in the tubular part in an inserted state. The decorative piping member includes a warp and a weft that both form the tubular part and the seam margin part, and an insertion thread that forms the core part. These are integrally woven with a loom. The seam margin part of the decorative piping member is sandwiched by and between an end part of the first fabric and an end part of the second fabric, and these parts are sewed together in a mutually overlapped state.