WE CLAIM:
1. A tubular woven fabric comprising warp yarns and weft yarns
interwoven with each other, the tubular woven fabric having an
outer diameter with a variation of within 10% along the warp
direction and satisfying the following formula:
(L2 - LI)/LI > 0.1 wherein
LI is a gauge length of the tubular woven fabric when compressed in the warp direction by applying a stress of 0.01 cN/dtex, as determined after the outer diameter of the tubular woven fabric is measured without applying stress to the tubular woven fabric to determine a maximum outer diameter and then gauge marks are drawn around an outer circumference of the tubular woven fabric so that the gauge marks are separated by a length of five times the maximum outer diameter of the tubular woven fabric; and
L2 is a gauge length of the tubular woven fabric when elongated in the warp direction by applying a stress of 0.01 cN/dtex, as determined after the outer diameter of the tubular woven fabric is measured without applying stress to the tubular woven fabric to determine a maximum outer diameter and then gauge marks are drawn around an outer circumference of the tubular woven fabric so that the gauge marks are separated by a length of five times the maximum outer diameter of the tubular woven fabric.
2. The tubular woven fabric according to claim 1, which has a
change index (c) of 0 . 03 or more and less than 0 .2, as determined

by the following formula:
Change index, c = (a - b)/a wherein
a is a maximum outer diameter of the tubular woven fabric when compressed in the warp direction by applying a stress of 0.01 cN/dtex, and
b is a minimum outer diameter of the tubular woven fabric when elongated in the warp direction by applying a stress of 0.01 cN/dtex.
3. The tubular woven fabric according to claim 1 or 2, which has an inner surface with an irregularity of 100 \xm or less.
4. The tubular woven fabric according to any one of claims 1 to 3, which has no circumferential corrugations.
5. The tubular woven fabric according to any one of claims 1 to 4, wherein the warp and weft yarns constituting the tubular woven fabric are synthetic fiber yarns.
6. The tubular woven fabric according to claim 5, wherein the synthetic fiber yarns constituting the tubular woven fabric are non-elastic polyester yarns.
7. The tubular woven fabric according to claim 5 or 6, wherein the synthetic fiber yarns serving as the warp yarns constituting the tubular woven fabric are multifilament yarns containing filaments, wherein a part or all of the filaments have a diameter of 5 (iiti or less.

8. A vascular prosthesis comprising the tubular woven fabric according to any one of claims 1 to 7 as a base material.
9. A vascular prosthesis comprising the tubular woven fabric according to any one of claims 1 to 7 as a base material, the base material having an inner surface having a layer of an antithrombogenic material.

10. The vascular prosthesis according to claim 9, wherein the antithrombogenic material contains a sulfur-containing anionic compound having anticoagulant activity.
11. The vascular prosthesis according to claim 9 or 10, wherein the antithrombogenic material contains a cationic polymer containing, as a monomer unit, a compound selected from the group consisting of alkylene imines, vinyl amines, allylamine, lysine, protamines, and diallyl dimethyl ammonium chloride, and wherein the cationic polymer is covalently bound to warp and weft yarns constituting the tubular woven fabric having an inner surface to be in contact with blood.
12. A vascular prosthesis comprising the tubular woven fabric according to any one of claims 8 to 11 as a base material, the base material having an outer surface having a layer of a bioabsorbable material.
13. The vascular prosthesis according to claim 12, which has a kink radius of 15 mm or less.

14. The vascular prosthesis according to claim 12 or 13, which
has a water permeability of 10 mL/cm2-min or less as measured by applying a pressure of 120 mmHg to an inner surface of the vascular prosthesis at 25°C.
15. The vascular prosthesis according to any one of claims 12 to 14, wherein the bioabsorbable material is a homopolymer or copolymer containing a monomer unit selected from the group consisting of lactic acid, glycolic acid, caproic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, maleic acid, fumaric acid, ethylene glycol, propylene glycol, vinylpyrrolidone and vinyl alcohol.
16. The vascular prosthesis according to any one of claims 12 to 15, wherein the bioabsorbable material is a polysaccharide or a protein.
17. The vascular prosthesis according to claim 16, wherein the protein is selected from the group consisting of collagen, atelocollagen and gelatin.