A system comprising: a powerplant unit that includes an internal combustion engine and generates a drive force for running a vehicle; and a pendulum type mount system for mounting the powerplant unit on a vehicle body of the vehicle, the pendulum type mount system comprising, with respect to the vehicle driving direction: an upper right mount that mounts an upper right portion of the powerplant unit on the vehicle body; and an upper left mount that mounts an upper left portion of the powerplant unit on the vehicle body; characterized in that the pendulum type mount system further comprises: a pair of first and second lower torque rods (2L1, 2L2) that connect a lower portion of the powerplant unit with the vehicle body on a rear side of the powerplant unit, wherein the first and second lower torque rods (2L1, 2L2) are located on opposite sides to each other with respect to a reference plane that includes a gravity center of the powerplant unit and is perpendicular to a lateral direction of the vehicle body, wherein a first spring constant of the first lower torque rod (2L1) is not smaller than a second spring constant of the second lower torque rod (2L2), wherein, when a plane that includes a connecting point of the first lower torque rod (2L1) with the powerplant unit and is perpendicular to the lateral direction is denoted as a first plane and a plane that includes a connecting point of the second lower torque rod (2L2) with the powerplant unit and is perpendicular to the lateral direction is denoted as a second plane, a distance between the first plane and the reference plane is not larger than a distance between the second plane and the reference plane. a powerplant unit that includes an internal combustion engine and generates a drive force for running a vehicle; and a pendulum type mount system for mounting the powerplant unit on a vehicle body of the vehicle, the pendulum type mount system comprising, with respect to the vehicle driving direction: an upper right mount that mounts an upper right portion of the powerplant unit on the vehicle body; and an upper left mount that mounts an upper left portion of the powerplant unit on the vehicle body; an upper right mount that mounts an upper right portion of the powerplant unit on the vehicle body; and an upper left mount that mounts an upper left portion of the powerplant unit on the vehicle body; characterized in that the pendulum type mount system further comprises: a pair of first and second lower torque rods (2L1, 2L2) that connect a lower portion of the powerplant unit with the vehicle body on a rear side of the powerplant unit, wherein the first and second lower torque rods (2L1, 2L2) are located on opposite sides to each other with respect to a reference plane that includes a gravity center of the powerplant unit and is perpendicular to a lateral direction of the vehicle body, wherein a first spring constant of the first lower torque rod (2L1) is not smaller than a second spring constant of the second lower torque rod (2L2), wherein, when a plane that includes a connecting point of the first lower torque rod (2L1) with the powerplant unit and is perpendicular to the lateral direction is denoted as a first plane and a plane that includes a connecting point of the second lower torque rod (2L2) with the powerplant unit and is perpendicular to the lateral direction is denoted as a second plane, a distance between the first plane and the reference plane is not larger than a distance between the second plane and the reference plane. a pair of first and second lower torque rods (2L1, 2L2) that connect a lower portion of the powerplant unit with the vehicle body on a rear side of the powerplant unit, wherein the first and second lower torque rods (2L1, 2L2) are located on opposite sides to each other with respect to a reference plane that includes a gravity center of the powerplant unit and is perpendicular to a lateral direction of the vehicle body, wherein a first spring constant of the first lower torque rod (2L1) is not smaller than a second spring constant of the second lower torque rod (2L2), wherein, when a plane that includes a connecting point of the first lower torque rod (2L1) with the powerplant unit and is perpendicular to the lateral direction is denoted as a first plane and a plane that includes a connecting point of the second lower torque rod (2L2) with the powerplant unit and is perpendicular to the lateral direction is denoted as a second plane, a distance between the first plane and the reference plane is not larger than a distance between the second plane and the reference plane.