Communication quality such as a delay time is stabilized when a plurality of communication devices on the same mobile object simultaneously perform communication. A wireless communication system that is mounted on a mobile object is a wireless communication system including a first communication device and a second communication device that are mounted on a first mobile object. When information is shared by mobile objects by transmitting packets based on information acquired from a network within the first mobile object to a communication device mounted on a second mobile object, the first communication device and the second communication device transmit packets having the same content by adopting the same communication method and using different channels, and a signal transmission timing from the second communication device is set to be later than a transmission timing from a communication device from the first communication device.