In an electric grass cutting machine relating to the present invention, an electric motor (2) for driving a travelling device having a pair of left and right front wheels (1F) and a pair of left and right rear wheels (1R) and a gear transmission for speed-changing output from the electric motor (2) and transmitting the resultant power to the travelling device are disposed between the left and right rear wheels (1R) and arranged one after the other in the front/rear direction at positions laterally of a conveying duct (44) for guiding cut grass pieces from a rear discharge type mower device to a grass collecting container (50) supported to a rear portion of a machine body frame (10).
