A driving unit to be equipped with a vehicle, the driving unit comprising: a rotary electric machine which has a rotation axis extending in a horizontal left-right direction (L-R) of the vehicle; a rotary electric machine unit which includes a rotary electric machine case having a rotary electric machine accommodating portion accommodating the rotary electric machine; and an electric power conversion device which is electrically connected to the rotary electric machine and converts electric power supplied to the rotary electric machine and electric power supplied from the rotary electric machine, wherein: the electric power conversion device has an electric power conversion device case and is disposed on one side of the rotary electric machine case in a front-rear direction (Fr- Rr) orthogonal to both the rotation axis direction (L-R) and an up-down direction (U-D) of the vehicle; and the electric power conversion device case is fixed to the rotary electric machine case; a connecting portion where the rotary electric machine and the electric power conversion device are electrically connected is provided, the connecting portion being disposed below the rotation axis and between the rotary electric machine and the electric power conversion device in the front-rear direction (Fr-Rr); and a guide portion protruding rearward in the front-rear direction (Fr-Rr) and extending in the rotation axis direction (L-R) is formed above the connecting portion at either the electric power conversion device case or the rotary electric machine case, characterized in that the guide portion has a tapered portion where a protrusion length in the front-rear direction (Fr-Rr) decreases as a distance from the connecting portion increases in the rotation axis direction (L-R), such that a foreign matter entering from above the connecting portion is guided in the rotation axis direction (L-R) along the guide portion. a rotary electric machine which has a rotation axis extending in a horizontal left-right direction (L-R) of the vehicle; a rotary electric machine unit which includes a rotary electric machine case having a rotary electric machine accommodating portion accommodating the rotary electric machine; and an electric power conversion device which is electrically connected to the rotary electric machine and converts electric power supplied to the rotary electric machine and electric power supplied from the rotary electric machine, wherein: the electric power conversion device has an electric power conversion device case and is disposed on one side of the rotary electric machine case in a front-rear direction (Fr- Rr) orthogonal to both the rotation axis direction (L-R) and an up-down direction (U-D) of the vehicle; and the electric power conversion device case is fixed to the rotary electric machine case; a connecting portion where the rotary electric machine and the electric power conversion device are electrically connected is provided, the connecting portion being disposed below the rotation axis and between the rotary electric machine and the electric power conversion device in the front-rear direction (Fr-Rr); and a guide portion protruding rearward in the front-rear direction (Fr-Rr) and extending in the rotation axis direction (L-R) is formed above the connecting portion at either the electric power conversion device case or the rotary electric machine case, characterized in that the guide portion has a tapered portion where a protrusion length in the front-rear direction (Fr-Rr) decreases as a distance from the connecting portion increases in the rotation axis direction (L-R), such that a foreign matter entering from above the connecting portion is guided in the rotation axis direction (L-R) along the guide portion. the electric power conversion device has an electric power conversion device case and is disposed on one side of the rotary electric machine case in a front-rear direction (Fr- Rr) orthogonal to both the rotation axis direction (L-R) and an up-down direction (U-D) of the vehicle; and the electric power conversion device case is fixed to the rotary electric machine case; a connecting portion where the rotary electric machine and the electric power conversion device are electrically connected is provided, the connecting portion being disposed below the rotation axis and between the rotary electric machine and the electric power conversion device in the front-rear direction (Fr-Rr); and a guide portion protruding rearward in the front-rear direction (Fr-Rr) and extending in the rotation axis direction (L-R) is formed above the connecting portion at either the electric power conversion device case or the rotary electric machine case, characterized in that the guide portion has a tapered portion where a protrusion length in the front-rear direction (Fr-Rr) decreases as a distance from the connecting portion increases in the rotation axis direction (L-R), such that a foreign matter entering from above the connecting portion is guided in the rotation axis direction (L-R) along the guide portion.