Automatic transmission drive apparatus for vehicle, an arranging method for an oil pressure output device and a method of providing an automatic transmission drive apparatus

An oil-pressure output device (electric pump unit 21 ) is arranged on an outer wall face of an automatic transmission 1 which is positioned on an opposite side to an engine 2 (left side of a vehicle). An arrangement position of the oil-pressure output device is out of a movable range of one of the steered driving wheels which is located on the opposite side to the engine (left front wheel 17 ). Accordingly, a simpler layout change between a case of attaching the oil-pressure output device to the automatic transmission and another case of not attaching the one can be provided, so that commonality of components or layout of the automatic transmission and its surrounding devices and structures can be provided.