A vehicular communication device is provided. The vehicular communication device includes a reception section that, from a periphery vehicle equipped with a wide area communicator, receives a communication performance index representing performance of the wide area communicator, and a controller. The controller includes a reference value setup section that successively settles a reference value as a criterion based on the communication performance indexes received from multiple periphery vehicles, an acquisition section that acquires the communication performance index for a targeted wide area communicator which is the wide area communicator targeted at anomaly determination, and an anomaly determination section that determines an anomaly of the targeted wide area communicator based on comparison between the reference value settled by the reference value setup section and the communication performance index acquired by the acquisition section for the targeted wide area communicator.