A lower extremity support tool includes: a right and a left foot parts, a right and a left leg parts, a lower back part disposed in an area of a lower back of the user, the lower back part rotatably supporting individually each of the right and the left leg parts, the lower back part including a right and a left motors each causing one of the right and the left leg parts to normally rotate or reversely rotate and a control part that controls the normal rotation and the reverse rotation of each of the the right and the left motors in the lower back part.
