A drive unit comprising: a rear hub provided to a rear wheel; a rear arm; a first power system including an electric motor, the electric motor being accommodated in the rear wheel and including a rotor and a stator, the first power system being configured to transmit rotation of the rotor to the rear hub; and a second power system including a crank shaft having pedals attached thereto, and configured to transmit rotation of the crank shaft to the rear hub, wherein the second power system includes a power transmission mechanism (27, 26), the second power system being configured to transmit the rotation of the crank shaft to the rear hub through the power transmission mechanism (27, 26), the rear arm and the power transmission mechanism (27, 26) are disposed in a first direction, which is one of a rightward direction and a leftward direction, with respect to a center of the rear wheel in a left-right direction, characterized in that the second power system includes a transmission shaft and the power transmission mechanism (27, 26), the transmission shaft being rotatable and disposed radially inward of the stator, the power transmission mechanism (27, 26) coupling the crank shaft to the transmission shaft, the second power system being configured to transmit the rotation of the crank shaft to the rear hub through the power transmission mechanism (27, 26) and the transmission shaft, wherein the transmission shaft is coupled to the rear hub at a position in a second direction, which is a direction opposite to the first direction, with respect to the center of the rear wheel in the left-right direction. a rear hub provided to a rear wheel; a rear arm; a first power system including an electric motor, the electric motor being accommodated in the rear wheel and including a rotor and a stator, the first power system being configured to transmit rotation of the rotor to the rear hub; and a second power system including a crank shaft having pedals attached thereto, and configured to transmit rotation of the crank shaft to the rear hub, wherein the second power system includes a power transmission mechanism (27, 26), the second power system being configured to transmit the rotation of the crank shaft to the rear hub through the power transmission mechanism (27, 26), the rear arm and the power transmission mechanism (27, 26) are disposed in a first direction, which is one of a rightward direction and a leftward direction, with respect to a center of the rear wheel in a left-right direction, characterized in that the second power system includes a transmission shaft and the power transmission mechanism (27, 26), the transmission shaft being rotatable and disposed radially inward of the stator, the power transmission mechanism (27, 26) coupling the crank shaft to the transmission shaft, the second power system being configured to transmit the rotation of the crank shaft to the rear hub through the power transmission mechanism (27, 26) and the transmission shaft, wherein the transmission shaft is coupled to the rear hub at a position in a second direction, which is a direction opposite to the first direction, with respect to the center of the rear wheel in the left-right direction.