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A tower-type solar concentrator has a lot of devices called heliostat. They have mirrors for reflecting sunlight and can track the sun. The purposes of this study are to propose a high accuracy adjustment method for cluster-type heliostat with multiple mirrors and to investigate the influence on the divergence of the optical axis. In order to improve the accuracy of optical axis adjustment for heliostat of beam-down solar concentrator, an optical axis adjustment device was designed and manufactured. The accuracy and divergence of axes were evaluated quantitatively and theoretically. Developed optical axis adjustment device could adjust mirrors of heliostats with accuracy. The maximum divergence between the theoretical target and the axis was significantly improved by the new adjustment method.