This predicted travel behavior data correction device, which is a device for correcting predicted travel behavior data, is provided with: a generation unit which generates first predicted travel behavior data (defined below); a communication unit which receives second predicted travel behavior data (defined below) via vehicle-to-vehicle communication; and a correction unit which corrects the first predicted travel behavior data and/or the second predicted travel behavior data on the basis of a predetermined safety margin so that the start time of a first prediction period and the start time of a second prediction period synchronize with each other, and a first time interval and a second time interval coincide with each other. The first predicted travel behavior data: predicted travel behavior data indicating predicted travel behavior of a host vehicle as obtained at the first time interval, which is predetermined, within the first prediction period, which is a future period. The second predicted travel behavior data: predicted travel behavior data indicating predicted travel behavior of another vehicle as obtained at the second time interval, which is predetermined, within the second prediction period, which is a future period.
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