A composite sheet having a longitudinal axis (c-c), said composite sheet comprising a base layer having upper and lower surfaces and a surface layer comprised of continuous fibers extending along said longitudinal axis (c-c) and having a predetermined width defined between transversely opposite side edges of said surface layer along said longitudinal axis (c-c) and attached to at least one of the upper and lower surfaces by a plurality of the attaching lines extending in a direction intersecting said longitudinal axis (c-c), said longitudinal axis (c-c) substantially bisecting said width of said surface layer; wherein: said attaching lines comprise a plurality of first attaching lines extending at intervals in one half region of said surface layer defined on one side of said longitudinal axis (c-c) and second attaching lines extending at intervals in the other half region of said surface layer on the other side of said longitudinal axis (c-c); said first and second attaching lines (5A,5B) each having a second end (12A,12B) at or in a vicinity of one of said opposite side edges, and said first and second attaching lines (5A,5B) extend obliquely to said longitudinal axis (c-c); said composite sheet being characterised in that:- each of said first and second attaching lines (5A,5B) also has a first end (11A,11B) at or in a vicinity of said longitudinal axis (c-c); an imaginary line extending transversely of said composite sheet intersects both said first end of each first attaching line and said second end of an immediately adjacent first attaching line; an imaginary line extending transversely of said composite sheet intersects both said first end of each second attaching line and said second end of an immediately adjacent second attaching line; and the attaching lines extend from the longitudinal axis (c-c) to the side edges but the first ends (11A,11B) of the first and second attaching lines (5A, 5B) are out of intersection on the longitudinal axis (c-c). said attaching lines comprise a plurality of first attaching lines extending at intervals in one half region of said surface layer defined on one side of said longitudinal axis (c-c) and second attaching lines extending at intervals in the other half region of said surface layer on the other side of said longitudinal axis (c-c); said first and second attaching lines (5A,5B) each having a second end (12A,12B) at or in a vicinity of one of said opposite side edges, and said first and second attaching lines (5A,5B) extend obliquely to said longitudinal axis (c-c); said composite sheet being characterised in that:- each of said first and second attaching lines (5A,5B) also has a first end (11A,11B) at or in a vicinity of said longitudinal axis (c-c); an imaginary line extending transversely of said composite sheet intersects both said first end of each first attaching line and said second end of an immediately adjacent first attaching line; an imaginary line extending transversely of said composite sheet intersects both said first end of each second attaching line and said second end of an immediately adjacent second attaching line; and the attaching lines extend from the longitudinal axis (c-c) to the side edges but the first ends (11A,11B) of the first and second attaching lines (5A, 5B) are out of intersection on the longitudinal axis (c-c).