A power transmission device for a vehicle, the power transmission device comprising: a continuously variable transmission provided between an input shaft and an output shaft, the input shaft being configured so that the torque output from a driving force source can be input to the input shaft, the output shaft being configured to output torque, the continuously variable transmission being configured to continuously change a speed ratio and comprising a drive-side member and an output-side member, torque can be transmitted from the input shaft to the drive-side member, the output-side member is configured to output torque to the output shaft; a gear train provided between the input shaft and the output shaft, the continuously variable transmission and the gear train being configured to transmit torque between the input shaft and the output shaft; a forward-reverse switching mechanism arranged along the same axis as an axis of the input shaft, the forward-reverse switching mechanism being configured to carry out differential action by using three rotating elements, the three rotating elements including an input element, an output element and a reaction element of which rotation is stopped to rotate the input element and the output element in mutually opposite directions, the input element and the output shaft being coupled to each other via the continuously variable transmission, the output element and the output shaft being coupled to each other via the gear train; a first clutch mechanism configured to couple at least two rotating elements among the three rotating elements; a brake mechanism configured to stop rotation of the reaction element; a second clutch mechanism provided between the output-side member and the output shaft, configured to selectively couple the output-side member to the output shaft and transmit or interrupt torque through a first torque transmission path that is routed from the input shaft to the output shaft via the continuously variable transmission; and a third clutch mechanism provided in and configured to transmit or interrupt torque through a second torque transmission path that is routed from the output element to the output shaft via the gear train, the third clutch mechanism being an intermeshing clutch; the power transmission device being characterized in that the gear train has at least one speed ratio that cannot be set as a speed ratio of the continuously variable transmission. a continuously variable transmission provided between an input shaft and an output shaft, the input shaft being configured so that the torque output from a driving force source can be input to the input shaft, the output shaft being configured to output torque, the continuously variable transmission being configured to continuously change a speed ratio and comprising a drive-side member and an output-side member, torque can be transmitted from the input shaft to the drive-side member, the output-side member is configured to output torque to the output shaft; a gear train provided between the input shaft and the output shaft, the continuously variable transmission and the gear train being configured to transmit torque between the input shaft and the output shaft; a forward-reverse switching mechanism arranged along the same axis as an axis of the input shaft, the forward-reverse switching mechanism being configured to carry out differential action by using three rotating elements, the three rotating elements including an input element, an output element and a reaction element of which rotation is stopped to rotate the input element and the output element in mutually opposite directions, the input element and the output shaft being coupled to each other via the continuously variable transmission, the output element and the output shaft being coupled to each other via the gear train; a first clutch mechanism configured to couple at least two rotating elements among the three rotating elements; a brake mechanism configured to stop rotation of the reaction element; a second clutch mechanism provided between the output-side member and the output shaft, configured to selectively couple the output-side member to the output shaft and transmit or interrupt torque through a first torque transmission path that is routed from the input shaft to the output shaft via the continuously variable transmission; and a third clutch mechanism provided in and configured to transmit or interrupt torque through a second torque transmission path that is routed from the output element to the output shaft via the gear train, the third clutch mechanism being an intermeshing clutch; the power transmission device being characterized in that the gear train has at least one speed ratio that cannot be set as a speed ratio of the continuously variable transmission.