An electric drive vehicle that is configured to travel while receiving electric power from an electric power supply facility which completes an electric closed circuit by a trolley line on a high-voltage side and a trolley line on a ground side, the electric drive vehicle comprising: a first slider plate configured to contact the trolley line on the high-voltage side; a second slider plate configured to contact the trolley line on the ground side; a camera installed below the second slider plate; a monitor configured to display information for supporting the driving; and a controller configured to control the display of the monitor, characterized in that the camera installed below the second slider plate is adapted to take as a photographing range the whole of the second slider plate and a part of the trolley line on the ground side residing around the second slider plate, and the controller has: an image pattern storage section configured to store a plurality of image patterns for the second slider plate in which dimensions for the second slider plate image differ in dependence on the relative vertical distance between the camera and the second slider plate; a relative distance calculation section configured to input image data taken by the camera, to execute a pattern matching processing between the image data taken by the camera and each of the plurality of different image patterns stored in the image pattern storage section, and to calculate a relative lateral distance between the trolley line on the ground side and a reference position of the second slider plate by use of the number of pixels on an image of the image pattern that is the highest in a degree of matching with the image data taken by the camera; and a bird's eye view image data generation section configured to generate bird's eye view image data by synthesizing a second symbol image (71, 71a, 71b, 71c) representing the trolley line on the ground side and the second slider plate which reflect the relative lateral distance calculated by the relative distance calculation section, on a first symbol image representing the electric drive vehicle and configured to output the bird's eye view image data to the monitor. a first slider plate configured to contact the trolley line on the high-voltage side; a second slider plate configured to contact the trolley line on the ground side; a camera installed below the second slider plate; a monitor configured to display information for supporting the driving; and a controller configured to control the display of the monitor, characterized in that the camera installed below the second slider plate is adapted to take as a photographing range the whole of the second slider plate and a part of the trolley line on the ground side residing around the second slider plate, and the controller has: an image pattern storage section configured to store a plurality of image patterns for the second slider plate in which dimensions for the second slider plate image differ in dependence on the relative vertical distance between the camera and the second slider plate; a relative distance calculation section configured to input image data taken by the camera, to execute a pattern matching processing between the image data taken by the camera and each of the plurality of different image patterns stored in the image pattern storage section, and to calculate a relative lateral distance between the trolley line on the ground side and a reference position of the second slider plate by use of the number of pixels on an image of the image pattern that is the highest in a degree of matching with the image data taken by the camera; and a bird's eye view image data generation section configured to generate bird's eye view image data by synthesizing a second symbol image (71, 71a, 71b, 71c) representing the trolley line on the ground side and the second slider plate which reflect the relative lateral distance calculated by the relative distance calculation section, on a first symbol image representing the electric drive vehicle and configured to output the bird's eye view image data to the monitor. an image pattern storage section configured to store a plurality of image patterns for the second slider plate in which dimensions for the second slider plate image differ in dependence on the relative vertical distance between the camera and the second slider plate; a relative distance calculation section configured to input image data taken by the camera, to execute a pattern matching processing between the image data taken by the camera and each of the plurality of different image patterns stored in the image pattern storage section, and to calculate a relative lateral distance between the trolley line on the ground side and a reference position of the second slider plate by use of the number of pixels on an image of the image pattern that is the highest in a degree of matching with the image data taken by the camera; and a bird's eye view image data generation section configured to generate bird's eye view image data by synthesizing a second symbol image (71, 71a, 71b, 71c) representing the trolley line on the ground side and the second slider plate which reflect the relative lateral distance calculated by the relative distance calculation section, on a first symbol image representing the electric drive vehicle and configured to output the bird's eye view image data to the monitor.