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In this paper, we investigate multiple flexible spacecrafts attitude synchronization with parametric uncertainties and external disturbances. A large number of results on this problem rely on accurate measurements, ignoring measurement noises in attitude and angular velocity feedback. However, the existence of inherent noises and accumulated measurement errors are invertible, such that the performance of synchronization may be damaged. By developing a decentralized measurement-based attitude controller, we achieve attitude synchronization having input-to-state stability (ISS) with respect to measurement noises as external input. Moreover, thanks to the ISS-based robust design procedure, each of flexible spacecraft attitude control subsystem gains modeled external disturbance rejection, as well as unmodeled actuator disturbances attenuation and robustness with regarding to uncertain parameters.