A vehicle driving device comprising: a first electric motor and a second electric motor, which are disposed next to each other; a liquid medium supply device disposed between one end which is one end of the first electric motor opposite to the second electric motor and the other end which is one end of the second electric motor opposite to the first electric motor in an aligned direction of the first and second electric motors (2A, 2B), the liquid medium supply device being configured to supply a liquid medium to portions (A1, B1, A2, B2) to be cooled/lubricated, which are at least one of portions (A1, B1) of the first and second electric motors (2A, 2B) to be cooled and portions (A2, B2) of the first and second electric motors (2A, 2B) to be lubricated; a first cooling/lubrication flow passage (120A, 121A) through which the liquid medium is supplied from the liquid medium supply device to the portion (A1, B1) of the first electric motor to be cooled/lubricated via a region outward of the one end of the first electric motor; a second cooling/lubrication flow passage (120B, 121B) through which the liquid medium is supplied from the liquid medium supply device to the portion (A2, B2) of the second electric motor to be cooled/lubricated via a region outward of the other end of the second electric motor; a case which accommodates the first electric motor; and a separate member which is detachably provided to the case and on which the liquid medium supply device is provided, wherein the case comprises an opening which is opened outward, characterized in that the case comprises a reservoir for reserving the liquid medium and the first cooling/lubrication flow passage (120A, 121A), the liquid medium supply device discharges the liquid medium sucked from the reservoir and supplies, via the first cooling/lubrication flow passages (120A, 121A), the liquid medium to the portion (A1, B1) of the first electric motor to be cooled/lubricated, and in an attached state where a separate member fixation portion of the case and a case fixation portion of the separate member are fixed to each other, the opening of the case is closed by the separate member, and a discharge-side flow passage of the liquid medium supply device, which is provided on the separate member, and the first cooling/lubrication flow passage (120A, 121A) of the case are connected to each other. a first electric motor and a second electric motor, which are disposed next to each other; a liquid medium supply device disposed between one end which is one end of the first electric motor opposite to the second electric motor and the other end which is one end of the second electric motor opposite to the first electric motor in an aligned direction of the first and second electric motors (2A, 2B), the liquid medium supply device being configured to supply a liquid medium to portions (A1, B1, A2, B2) to be cooled/lubricated, which are at least one of portions (A1, B1) of the first and second electric motors (2A, 2B) to be cooled and portions (A2, B2) of the first and second electric motors (2A, 2B) to be lubricated; a first cooling/lubrication flow passage (120A, 121A) through which the liquid medium is supplied from the liquid medium supply device to the portion (A1, B1) of the first electric motor to be cooled/lubricated via a region outward of the one end of the first electric motor; a second cooling/lubrication flow passage (120B, 121B) through which the liquid medium is supplied from the liquid medium supply device to the portion (A2, B2) of the second electric motor to be cooled/lubricated via a region outward of the other end of the second electric motor; a case which accommodates the first electric motor; and a separate member which is detachably provided to the case and on which the liquid medium supply device is provided, wherein the case comprises an opening which is opened outward, characterized in that the case comprises a reservoir for reserving the liquid medium and the first cooling/lubrication flow passage (120A, 121A), the liquid medium supply device discharges the liquid medium sucked from the reservoir and supplies, via the first cooling/lubrication flow passages (120A, 121A), the liquid medium to the portion (A1, B1) of the first electric motor to be cooled/lubricated, and in an attached state where a separate member fixation portion of the case and a case fixation portion of the separate member are fixed to each other, the opening of the case is closed by the separate member, and a discharge-side flow passage of the liquid medium supply device, which is provided on the separate member, and the first cooling/lubrication flow passage (120A, 121A) of the case are connected to each other.