There has recently been an increasing interest in the quality of life for patients who had an operation for gastric cancer. Conventional reconstructions, and Billroth I and II operations have post-operative problems such as weight loss, nutritional deficiency, dumping syndrome and bile reflux gastritis. To prevent these problems, many operative methods, including jejunal pouch interposition, have been introduced. It is unclear whether this reconstructed pouch functions as gastric reservoir or if it has motility. We experienced a case of gastroparesis in a woman who had had a jejunal pouch interposition with distal gastrectomy created due to early gastric cancer. The function of interposed jejunal pouch was evaluated with using antroduodenal manometry. This test did not show cyclic waves in the pouch during fasting state or any increase in wave amplitude during the post-prandial periods. After infusing intravenous erythromycin, there were evidences of propagated peristaltic waves within the jejunal pouch segment and high-amplitude phasic contractions that were characteristics of Phase III of the Migrating Motor Complex (MMC).