A driving assistance system for a vehicle comprising: a traveling condition detection means that detects a traveling condition of the vehicle; a drive operation detection means that detects a drive operation by a driver; a drive diagnosis means that detects an index for drive diagnosis based upon the drive operation detected by the drive operation detection means, and diagnoses a drive operation of the driver from the detected index, characterized in that the drive diagnosis means detects, as the index for drive diagnosis, a distribution of a parameter representing safety awareness and operation preference characteristics of the driver or smoothness and/or stability of the drive operation based upon the traveling condition detected by the traveling condition detection means and the drive operation detected by the drive operation detection means, and diagnoses a drive operation of the driver from the detected index, and an information setting means is provided that evaluates a drive diagnosis result by the drive diagnosis means in accordance with evaluation criteria so as to set a content of information provision to the driver, with the evaluation criteria including a first evaluation criterion based upon an operating condition of that day of the driver and a second evaluation criterion based upon a usual operating condition of the driver, wherein the usual operating condition is the operating condition of the driver over a greater period of time than that of the operating condition of that day, and an amount of data corresponding to the usual operating condition is greater than that of the operating condition of that day; and an information provision means is provided that performs information provision to the driver with the content set by the information setting means, wherein: the information setting unit evaluates the drive diagnosis result with the evaluation criteria, and, depending upon an evaluation result, sets an alarm or an operation improvement suggestion as the content of information provision, wherein the operation improvement suggestion praises improvement of the driver operation of the driver. a traveling condition detection means that detects a traveling condition of the vehicle; a drive operation detection means that detects a drive operation by a driver; a drive diagnosis means that detects an index for drive diagnosis based upon the drive operation detected by the drive operation detection means, and diagnoses a drive operation of the driver from the detected index, characterized in that the drive diagnosis means detects, as the index for drive diagnosis, a distribution of a parameter representing safety awareness and operation preference characteristics of the driver or smoothness and/or stability of the drive operation based upon the traveling condition detected by the traveling condition detection means and the drive operation detected by the drive operation detection means, and diagnoses a drive operation of the driver from the detected index, and an information setting means is provided that evaluates a drive diagnosis result by the drive diagnosis means in accordance with evaluation criteria so as to set a content of information provision to the driver, with the evaluation criteria including a first evaluation criterion based upon an operating condition of that day of the driver and a second evaluation criterion based upon a usual operating condition of the driver, wherein the usual operating condition is the operating condition of the driver over a greater period of time than that of the operating condition of that day, and an amount of data corresponding to the usual operating condition is greater than that of the operating condition of that day; and an information provision means is provided that performs information provision to the driver with the content set by the information setting means, wherein: the information setting unit evaluates the drive diagnosis result with the evaluation criteria, and, depending upon an evaluation result, sets an alarm or an operation improvement suggestion as the content of information provision, wherein the operation improvement suggestion praises improvement of the driver operation of the driver.