Driving assistance device

A driving assistance device comprising:

• a blind spot recognition unit that recognizes a blind spot of a driver in a progressing direction of a host vehicle;
• a mobile object information setting unit that sets mobile object information including at least an assumed speed of a mobile object, as information on the mobile object having a possibility of appearing suddenly from the blind spot;
• a speed zone computation unit that computes a speed zone of the host vehicle having a possibility that the host vehicle will come into contact with the mobile object when progressing in the progressing direction, based on the mobile object information set by the mobile object information setting unit;
• a brake avoidance condition computation unit that computes at least one condition of a brake avoidance condition that the host vehicle can avoid contact with the mobile object using a brake of the host vehicle and a brake avoidance condition that the mobile object can avoid contact with the host vehicle using a brake of the mobile object;
• a speed zone correction unit that corrects the speed zone based on the brake avoidance condition computed by the brake avoidance condition computation unit;
• and
• a target speed computation unit that computes a target speed of the host vehicle based on the speed zone,
• wherein the speed zone computation unit computes the speed zone by computing a condition that the mobile object can pass earlier than at least the host vehicle, based on the assumed speed of the mobile object.