A hybrid vehicle comprising: an engine ; a motor generator ; a clutch operated by a driver; a manual transmission receiving power transmitted from the engine through the clutch ; and a drive wheel receiving power transmitted from the manual transmission , wherein the manual transmission includes an input shaft receiving power input from the engine , a counter shaft disposed in parallel to the input shaft , a one-way clutch , and a plurality of gear pairs (10A-10F) changing a rotation speed of the input shaft and transmitting the rotation speed to the counter shaft , wherein the motor generator is connected to a power transmission path between the counter shaft and the drive wheel so that driving power is able to be transmitted, and the one-way clutch is provided in one gear of a specific gear pair of the plurality of gear pairs (10A-10F) and configured to prohibit the one gear from being driven by the counter shaft but to allow the one gear to drive the counter shaft in one rotational direction, wherein the specific gear pair constitutes a forward gear stage with the smallest reduction ratio of the plurality of gear pairs (10A-10F), the hybrid vehicle further comprising: a control unit switching an HEV mode allowing a running operation by the power of the engine and the power of the motor generator and an EV mode allowing a running operation by the power of the motor generator , the hybrid vehicle being characterized in that : when a predetermined EV mode transition condition, including a shift operation for shifting to the forward gear stage with the smallest reduction ratio, is established in the HEV mode, the control unit stops the engine and switches to the EV mode. an engine ; a motor generator ; a clutch operated by a driver; a manual transmission receiving power transmitted from the engine through the clutch ; and a drive wheel receiving power transmitted from the manual transmission , wherein the manual transmission includes an input shaft receiving power input from the engine , a counter shaft disposed in parallel to the input shaft , a one-way clutch , and a plurality of gear pairs (10A-10F) changing a rotation speed of the input shaft and transmitting the rotation speed to the counter shaft , wherein the motor generator is connected to a power transmission path between the counter shaft and the drive wheel so that driving power is able to be transmitted, and the one-way clutch is provided in one gear of a specific gear pair of the plurality of gear pairs (10A-10F) and configured to prohibit the one gear from being driven by the counter shaft but to allow the one gear to drive the counter shaft in one rotational direction, wherein the specific gear pair constitutes a forward gear stage with the smallest reduction ratio of the plurality of gear pairs (10A-10F), the hybrid vehicle further comprising: a control unit switching an HEV mode allowing a running operation by the power of the engine and the power of the motor generator and an EV mode allowing a running operation by the power of the motor generator , the hybrid vehicle being characterized in that : when a predetermined EV mode transition condition, including a shift operation for shifting to the forward gear stage with the smallest reduction ratio, is established in the HEV mode, the control unit stops the engine and switches to the EV mode. <EOS>