To provide an onboard communication unit that can easily update older information with new information without disturbing reception of important information when there is any information requiring updating.

In the case a reception state detection section 6d detects reception of prescribed information from an external information center, when an information management section 6b of a main controller 6 is about updating information reaching an update schedule time, an update temporary stop section 6e tentatively stops the update processing of the information until the reception of the information is finished. Thus, it is not required for a user to conduct troublesome operations to update information on each occasion and up-to-date information provides a pleasant car drive at all times.