We report a case of advanced schirrous gastric cancer with carcinomatous peritonitis. Chemotherapy with TS-1 was applied during the first 4 weeks, but the tumor did not respond to this therapy. Next, paclitaxel (TXL) was administered at a weekly dose of 90 mg/body/day for 3 weeks followed by a week interval of rest. Remarkable mass reduction of primary tumor was observed after 3 courses of treatment, and the symptom derived from primary tumor was relieved without significant side effects. The clinical course for schirrous gastric cancer with carcinomatous peritonitis is still miserable for patients, although many attempts have been made to improve its prognosis. A weekly paclitaxel regimen appears to be one of the promising treatment for schirrous gastric cancer.