An object recognition device mountable to a vehicle includes a tracking processing unit including a first association processing unit, a second association processing unit, and a vehicle likelihood calculation unit. The first association processing unit extracts, for each tracking target and based on a positional relationship, a provisionally associated cluster which is a cluster assumed to indicate the same target as the tracking target. The second association processing unit calculates a posterior confidence indicating a probability that when it is assumed that the provisionally associated cluster and the tracking target indicate the same target, the target is a vehicle, determines whether to perform association based on the calculated posterior confidence, and calculates the posterior confidence based on the posterior confidence calculated for the tracking target in the previous measurement cycle and on a cluster vehicle likelihood of the provisionally associated cluster calculated by the vehicle likelihood calculation unit.