A driving assistance device includes first acquisition means for acquiring driving status sensing data of a vehicle from a driving status sensing device provided in the vehicle, second acquisition means for acquiring biological information regarding a biological change of a driver of the vehicle, and determination means for determining occurrence of a dangerous event on the basis of a first occurrence index value for a dangerous event that is a value corresponding to the driving status sensing data and a second occurrence index value that is a value corresponding to the biological information of the driver.