An object of the present invention is to provide an on-vehicle information processing device that is capable of sufficiently calling attention of a driver of an own vehicle. The on-vehicle information processing device according to the present invention includes: an other-vehicle position detector that detects a position of another vehicle existing in a vicinity of an own vehicle; a communication unit that acquires, via communication, other-vehicle information including driver dynamic information from the other vehicle whose position is detected by the other-vehicle position detector, the driver dynamic information indicating a current state of activity of a driver of the other vehicle; and a controller that controls calling attention of a driver of the own vehicle or traveling of the own vehicle based on the driver dynamic information acquired by the communication unit.