PROBLEM TO BE SOLVED: To provide an electric riding mower of self-propelled type that is environmentally friendly by improving workability by making a rotation direction of a mowing blade changeable to a discharge direction of mowed grass with a simple structure while expanding the range of choices for the direction of discharging the mowed grass.SOLUTION: The electric riding mower includes two mowing blades 1,1 for rotating and mowing grass, a mowing deck of substantially bowl shape and two mowing motors 15, 15. The rotation direction of two mowing motors 15, 15 are respectively independently changeable. As well as right and left side discharging ports are formed by cutting a peripheral surface of the mowing deck of the direction on a line between the two mowing blades 1, 1, a rear side discharging port is formed by cutting the peripheral surface of the mowing deck positioned at the rear side. Then, there are detachably provided the left side discharging port, the right side discharging port, a left side discharging port cover for covering the respective rear side discharging ports, the right side discharging port cover and the rear side discharging port cover.COPYRIGHT: (C)2012,JPO&INPIT【課題】刈草排出方向の選択幅を増やすとともに、簡単な構成でモアブレードの回転方向を刈草排出方向に切換可能として作業性を向上させ、さらに環境に配慮した自走式の電動乗用草刈機を提供する。【解決手段】回転して草を刈る2枚のモアブレード1,1と、略深皿状のモアデッキと、2枚のモアモータ15,15とを備え、2枚のモアモータ15,15の回転方向がそれぞれ独立に変更自在であり、また、2枚のモアブレード1,1の回転軸を結ぶ方向のモアデッキの周面を切り取って左側排出口、右側排出口を形成するとともに、2枚のモアブレード1,1の回転軸を結ぶ方向と直交する方向で、かつ、後側に位置するモアデッキの周面を切り取って後側排出口を形成し、左側排出口、右側排出口、後側排出口のそれぞれを覆う左側排出口カバー、右側排出口カバー、後側排出口カバーを着脱自在に設ける。【選択図】図3