Provided is a mars light system wherein the light emitted from mars lights which are connected to each other can be synchronized even when problems occur in a part of mars lights or the disconnection of a signal line occurs. A mars light (4) is comprised of a light emitting portion (4c); a storage portion (4d) which stores light emitting information; a light emitting control portion (4b) which causes the light emitting portion (4c) to emit light on the basis of the light emitting information; and a signal input/output portion (4a) to which a synchronization control signal is input from other mars lights (3, 5), and from which the synchronization control signal is output to the other mars lights (3, 5). The mars light (4) judges whether or not another mars light which outputs a synchronization control signal is connected to the signal input/output portion (4a), and outputs a synchronization control signal when it is judged that a synchronization control signal is not input for a predetermined period of time.
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