The aim of this article is to offer new information on an astrolabe which was made in Korea and preserved in Japan. This instrument is very valuable since it is the only hitherto known typical type astrolabe that was made in East Asia. The present author has investigated this instrument in detail and found many particular features. Especially interesting is the positions of the fixed stars in this instrument. We do not know how these positions were obtained, nor do we why this kind of astrolabe was manufactured in Korea.