A vehicle-mounted warning system which is configured such that a warning lamp on a meter panel is turned on or blinked in the event of an abnormality with a vehicle has a detection unit configured to detect a mental turmoil of a driver, when the warning lamp is turned on or blinked, and a notification unit configured to notify the driver of a content of the warning of the lit or blinking warning lamp or how to cope with the warning thereof, when the mental turmoil of the driver is detected.