A hybrid vehicle comprising: an engine; a drive motor; a transmission comprising an input shaft, an output shaft, and a gear train, the transmission being configured to change the speed of rotation produced by drive power transmitted from the engine and the drive motor to the input shaft and output the resulting rotation to a drive wheel; a main clutch connected to one end of the input shaft of the transmission and disposed in a power transmission route between a crankshaft (Ea) of the engine and the input shaft of the transmission; a crankcase comprising a case body and a cover removably mounted on the case body, the crankcase having a main chamber formed in the case body and accommodating at least the crankshaft (Ea), the input shaft, the output shaft, and the gear train, the crankcase further having a subsidiary chamber formed between the case body and the cover and accommodating at least the main clutch; a rotary member disposed in the subsidiary chamber so as to be capable of power transmission to the input shaft; a power transmission member that transmits drive power from the drive motor to the rotary member, a primary gear disposed around the input shaft to transmit drive power from the engine to the main clutch; and a bearing supporting the input shaft, the bearing being fitted in a hole formed in a side wall portion of the case body, the side wall portion facing the subsidiary chamber, characterized in that: the rotary member is configured to rotate together with the input shaft, the primary gear is located between the main clutch and the gear train in an axial direction of the input shaft, and the rotary member is disposed between the bearing and the primary gear. an engine; a drive motor; a transmission comprising an input shaft, an output shaft, and a gear train, the transmission being configured to change the speed of rotation produced by drive power transmitted from the engine and the drive motor to the input shaft and output the resulting rotation to a drive wheel; a main clutch connected to one end of the input shaft of the transmission and disposed in a power transmission route between a crankshaft (Ea) of the engine and the input shaft of the transmission; a crankcase comprising a case body and a cover removably mounted on the case body, the crankcase having a main chamber formed in the case body and accommodating at least the crankshaft (Ea), the input shaft, the output shaft, and the gear train, the crankcase further having a subsidiary chamber formed between the case body and the cover and accommodating at least the main clutch; a rotary member disposed in the subsidiary chamber so as to be capable of power transmission to the input shaft; a power transmission member that transmits drive power from the drive motor to the rotary member, a primary gear disposed around the input shaft to transmit drive power from the engine to the main clutch; and a bearing supporting the input shaft, the bearing being fitted in a hole formed in a side wall portion of the case body, the side wall portion facing the subsidiary chamber, characterized in that: the rotary member is configured to rotate together with the input shaft, the primary gear is located between the main clutch and the gear train in an axial direction of the input shaft, and the rotary member is disposed between the bearing and the primary gear. the rotary member is configured to rotate together with the input shaft, the primary gear is located between the main clutch and the gear train in an axial direction of the input shaft, and the rotary member is disposed between the bearing and the primary gear.