A dangerous driving warning device configured to warn a host-vehicle (VA) that the host-vehicle (VA) is agitated by an other-vehicle (VB), the dangerous driving warning device comprising: a host-vehicle information acquisition unit configured to acquire host-vehicle information including at least one of travel information of the host-vehicle (VA), biological information of a driver of the host-vehicle (VA), and a facial expression of the driver of the host-vehicle (VA); a communication unit configured to acquire an agitating degree indicating a degree to which the other-vehicle (VB) is agitating the host-vehicle (VA), by means of radio communication, the agitating degree being calculated based on at least one of travel information of the other-vehicle (VB), biological information of a driver of the other-vehicle (VB), and a facial expression of the driver of the other-vehicle (VB); an agitated degree calculation unit configured to calculate an agitated degree indicating a degree to which the host-vehicle (VA) is agitated by the other-vehicle (VB), based on at least one of the travel information of the host-vehicle (VA), the biological information of the driver of the host-vehicle (VA), and the facial expression of the driver of the host-vehicle (VA) included in the host-vehicle information; a danger degree determination unit configured to determine a first evaluation value by referring to a first evaluation value table (TB1) in which the agitated degree is classified into a plurality of stages with an evaluation value set for each of the plurality of stages, to determine a second evaluation value by referring to a second evaluation value table (TB2) in which the agitating degree is classified into a plurality of stages with an evaluation value set for each of the plurality of stages, and to determine a warning content in accordance with the first evaluation value under a condition that the second evaluation value is equal to or above a predetermined evaluation value; and a presentation unit configured to present the warning content. a host-vehicle information acquisition unit configured to acquire host-vehicle information including at least one of travel information of the host-vehicle (VA), biological information of a driver of the host-vehicle (VA), and a facial expression of the driver of the host-vehicle (VA); a communication unit configured to acquire an agitating degree indicating a degree to which the other-vehicle (VB) is agitating the host-vehicle (VA), by means of radio communication, the agitating degree being calculated based on at least one of travel information of the other-vehicle (VB), biological information of a driver of the other-vehicle (VB), and a facial expression of the driver of the other-vehicle (VB); an agitated degree calculation unit configured to calculate an agitated degree indicating a degree to which the host-vehicle (VA) is agitated by the other-vehicle (VB), based on at least one of the travel information of the host-vehicle (VA), the biological information of the driver of the host-vehicle (VA), and the facial expression of the driver of the host-vehicle (VA) included in the host-vehicle information; a danger degree determination unit configured to determine a first evaluation value by referring to a first evaluation value table (TB1) in which the agitated degree is classified into a plurality of stages with an evaluation value set for each of the plurality of stages, to determine a second evaluation value by referring to a second evaluation value table (TB2) in which the agitating degree is classified into a plurality of stages with an evaluation value set for each of the plurality of stages, and to determine a warning content in accordance with the first evaluation value under a condition that the second evaluation value is equal to or above a predetermined evaluation value; and a presentation unit configured to present the warning content. <EOS>