An onboard device abnormal connection notification system is provided with: onboard
devices (3a, 3b) which is connected to an in-vehicle
network (5); a monitor means (1) which is connected to the in-vehicle
network (5) for monitoring an abnormality in the state of connection between
the onboard devices (3a, 3b) and the in-vehicle network
(5); and a notification means (2) which is connected to the in-vehicle
network (5) to notify an abnormality in connection of the onboard device
(3a, 3b) based on a demand from the monitor means (1).
