The patient was a 71-year-old female, who had been under hemodialysis since January 1991. On 13 October 1999, she stumbled and fell against the anastomosis site of the autogenous arteriovenous fistula, which became swollen to about 4×3cm on the ulnar side of left forearm. Angiography showed venous pseudoaneurysm measuring 2.1×1.5cm. Since the size of venous pseudoaneurysm was increased to 4.0×3.6cm detected by angiography, she underwent surgery on 5 November. Because the shunt was found to be occluded during operation, the site of venous pseudoaneurysm was excised and a new arteriovenous fistula was remade at a proximal site. Microscopic examination of resected venous pseudoaneurysm showed teared intimal and medial membranes of the shunt vein and the venous pseudoaneurysm consisted of only the outer membrane of the vein. As a cause of venous pseudoaneurysm, tear of the vein should be considered. Under such a condition, surgery is necessary as soon as possible. This case is valuable bacause a rapidly increasing venous pseudoaneurysm caused by a tear in the vein had not been reported previously.