A two-wheeled hybrid vehicle comprising a front wheel, a rear wheel, an engine, a power storage device, a motor configured to be driven by electrical power from the power storage device, a seat, and an accommodating unit formed below the seat; wherein the power storage device is disposed upwardly of the rear wheel so as to at least partially overlap with an upper open region (Za) of the accommodating unit as viewed from above, the power storage device comprising: a power storage device main body constituted by stacking a plurality of power storage cells; a case configured to cover the power storage device main body; and a power storage device arrangement body configured to arrange the case in a region (Zb) where the power storage device is disposed, in a state in which at least a portion of the case is covered; wherein the power storage device arrangement body is fixed to a vehicle body via a vehicle body mounting stay, the two-wheeled hybrid vehicle further comprising: seat frames (50, 54); and a cross frame configured to connect rear portions of the seat frames (50, 54), wherein a connection site between the power storage device arrangement body and a vehicle body mounting bracket, and a position of the cross frame overlap as viewed from above, the power storage device is disposed forwardly of the vehicle body mounting bracket, the two-wheeled hybrid vehicle further comprises a power cable connected to the power storage device, wherein the power cable is connected to a front side of the power storage device in a vehicle longitudinal direction, the case includes a terminal to which the power cable is connected, wherein the terminal is provided on a front side of the case in the vehicle longitudinal direction, and the motor is provided further forward in the vehicle longitudinal direction than the terminal. wherein the power storage device is disposed upwardly of the rear wheel so as to at least partially overlap with an upper open region (Za) of the accommodating unit as viewed from above, the power storage device comprising: a power storage device main body constituted by stacking a plurality of power storage cells; a case configured to cover the power storage device main body; and a power storage device arrangement body configured to arrange the case in a region (Zb) where the power storage device is disposed, in a state in which at least a portion of the case is covered; wherein the power storage device arrangement body is fixed to a vehicle body via a vehicle body mounting stay, a power storage device main body constituted by stacking a plurality of power storage cells; a case configured to cover the power storage device main body; and a power storage device arrangement body configured to arrange the case in a region (Zb) where the power storage device is disposed, in a state in which at least a portion of the case is covered; wherein the power storage device arrangement body is fixed to a vehicle body via a vehicle body mounting stay, the two-wheeled hybrid vehicle further comprising: seat frames (50, 54); and a cross frame configured to connect rear portions of the seat frames (50, 54), wherein a connection site between the power storage device arrangement body and a vehicle body mounting bracket, and a position of the cross frame overlap as viewed from above, the power storage device is disposed forwardly of the vehicle body mounting bracket, the two-wheeled hybrid vehicle further comprises a power cable connected to the power storage device, wherein the power cable is connected to a front side of the power storage device in a vehicle longitudinal direction, the case includes a terminal to which the power cable is connected, wherein the terminal is provided on a front side of the case in the vehicle longitudinal direction, and the motor is provided further forward in the vehicle longitudinal direction than the terminal. seat frames (50, 54); and a cross frame configured to connect rear portions of the seat frames (50, 54), wherein a connection site between the power storage device arrangement body and a vehicle body mounting bracket, and a position of the cross frame overlap as viewed from above, the power storage device is disposed forwardly of the vehicle body mounting bracket, the two-wheeled hybrid vehicle further comprises a power cable connected to the power storage device, wherein the power cable is connected to a front side of the power storage device in a vehicle longitudinal direction, the case includes a terminal to which the power cable is connected, wherein the terminal is provided on a front side of the case in the vehicle longitudinal direction, and the motor is provided further forward in the vehicle longitudinal direction than the terminal. the power storage device is disposed forwardly of the vehicle body mounting bracket, the two-wheeled hybrid vehicle further comprises a power cable connected to the power storage device, wherein the power cable is connected to a front side of the power storage device in a vehicle longitudinal direction, the case includes a terminal to which the power cable is connected, wherein the terminal is provided on a front side of the case in the vehicle longitudinal direction, and the motor is provided further forward in the vehicle longitudinal direction than the terminal.