A draft gate which is effective to reduce not only manufacturing but installation cost is presented. The draft gate presented here has feature that a gate casing and transition tube are fabricated in one block in firm by reducing their dimensions in flow direction; that reduce fabrication weight about 20% in comparison with conventional one. Hydraulic head loss increases for the presented type, however, the increase is about 0.035mAq for flow velocity of 5m/s, in other words, about 0.01% of total head of pumped storage power station in current design. The presented type is to be installed in a pumped storage power station of 1, 800MW, final capacity of 2, 700MW, in Japan.