To provide a system which maintains synchronization, while suppressing variation of internal timing, even when the transmission interval of a burst wave is long.

A radio synchronization device for synchronizing a subordinate synchronizing device 2 with a synchronization destination device 1 with a burst signal transmitted from the synchronization destination device 1 by radio, is provided with a means 7 for measuring the timing difference, between a timing signal reproduced from the burst signal and the internal timing signal of the subordinate synchronizing device 2 a plurality of times, a means for comparing the average value of timing differences of the plurality of times measured by the means with a value showing a prescribed allowable range and a means 8 for correcting the timing of the internal timing signal, when the average value exceeds the allowable range with the means.