A vehicle driving device comprising: a rotary electrical machine that functions as a driving force source of a wheel along with an internal combustion engine; a transmission device that is disposed side by side with respect to the rotary electrical machine in an axial direction, the axial direction being a direction in which a rotation axis center of the rotary electrical machine extends; a case including a first case section that accommodates the rotary electrical machine and a second case section that accommodates the transmission device; an inverter device that controls the rotary electrical machine; and a wiring member that connects the rotary electrical machine and the inverter device; wherein an oil-tight space, in which the first case section and the second case section are communicated, is formed, the second case section being joined to a side opposite to the internal combustion engine side in the axial direction of the first case section; an inverter accommodation chamber that accommodates the inverter device is formed along an outer peripheral wall of the second case section; the rotary electrical machine is accommodated in the oil-tight space; the wiring member is provided to pass through the second case section so as to cross the inverter accommodation chamber and the oil-tight space; and a seal member (61, 62) that seals between the second case section and the wiring member is provided, characterised in that the case further includes an intermediate wall disposed between the rotary electrical machine and the transmission device in the axial direction; the wiring member is provided through a through hole formed in the intermediate wall in the oil-tight space; and the through hole is formed at a position overlapping the rotary electrical machine as viewed in the axial direction. a rotary electrical machine that functions as a driving force source of a wheel along with an internal combustion engine; a transmission device that is disposed side by side with respect to the rotary electrical machine in an axial direction, the axial direction being a direction in which a rotation axis center of the rotary electrical machine extends; a case including a first case section that accommodates the rotary electrical machine and a second case section that accommodates the transmission device; an inverter device that controls the rotary electrical machine; and a wiring member that connects the rotary electrical machine and the inverter device; wherein an oil-tight space, in which the first case section and the second case section are communicated, is formed, the second case section being joined to a side opposite to the internal combustion engine side in the axial direction of the first case section; an inverter accommodation chamber that accommodates the inverter device is formed along an outer peripheral wall of the second case section; the rotary electrical machine is accommodated in the oil-tight space; the wiring member is provided to pass through the second case section so as to cross the inverter accommodation chamber and the oil-tight space; and a seal member (61, 62) that seals between the second case section and the wiring member is provided, characterised in that the case further includes an intermediate wall disposed between the rotary electrical machine and the transmission device in the axial direction; the wiring member is provided through a through hole formed in the intermediate wall in the oil-tight space; and the through hole is formed at a position overlapping the rotary electrical machine as viewed in the axial direction.