A driving assistance device for a vehicle comprising: a forward obstacle information calculation unit configured to calculate information on a forward obstacle from a surrounding recognition sensor of the vehicle; an acceleration operation detection unit configured to detect whether an acceleration operation is performed by a driver; a drive torque down control unit configured to execute drive torque down to avoid a collision with the forward obstacle when the drive torque down control unit determines that there is a high chance of the collision with the forward obstacle; a drive torque up control priority unit configured to prohibit the drive torque down control unit from executing the drive torque down and to give priority to executing drive torque up in a case in which the acceleration operation detection unit detects the acceleration operation performed by the driver at a predetermined level or higher when an execution condition of the drive torque down executed by the drive torque down control unit is satisfied; an abnormal acceleration element detection unit configured to detect whether an event that causes unintended acceleration is occuring; and a restriction unit configured to restrict a drive torque up amount, in a case in which the abnormal acceleration element detection unit detects that the event that causes the unintended acceleration is occurring when an execution condition gave priority to executing the drive torque up by the drive torque up control priority unit is satisfied; the driving assistance device being characterized in that: the abnormal acceleration element detection unit is configured to determine the event that causes the unintended acceleration is occurring when the tension applied to the seat belt increases, or, when the length by which the seat belt is pulled out increases. a forward obstacle information calculation unit configured to calculate information on a forward obstacle from a surrounding recognition sensor of the vehicle; an acceleration operation detection unit configured to detect whether an acceleration operation is performed by a driver; a drive torque down control unit configured to execute drive torque down to avoid a collision with the forward obstacle when the drive torque down control unit determines that there is a high chance of the collision with the forward obstacle; a drive torque up control priority unit configured to prohibit the drive torque down control unit from executing the drive torque down and to give priority to executing drive torque up in a case in which the acceleration operation detection unit detects the acceleration operation performed by the driver at a predetermined level or higher when an execution condition of the drive torque down executed by the drive torque down control unit is satisfied; an abnormal acceleration element detection unit configured to detect whether an event that causes unintended acceleration is occuring; and a restriction unit configured to restrict a drive torque up amount, in a case in which the abnormal acceleration element detection unit detects that the event that causes the unintended acceleration is occurring when an execution condition gave priority to executing the drive torque up by the drive torque up control priority unit is satisfied; the driving assistance device being characterized in that: the abnormal acceleration element detection unit is configured to determine the event that causes the unintended acceleration is occurring when the tension applied to the seat belt increases, or, when the length by which the seat belt is pulled out increases.