The purpose of this paper is to examine the foundation and subsequent reconstruction years of Unsoo-sa Daeoong-jeon in Busan, especially based on the five records of this building. Moreover, this paper aims to analyze the possibility of the architectural type changes by comparison with nearby Buddhist buildings. The results of this study are summarized as follows. First, Unsoo-sa Daeoong-jeon was built in 1655. Afterward, it had been repaired through five times, but most members of it's wood-framework were found to had been prepared and constructed in 1655. Second, such as the gongpo type, roof type, module system, intercolumnar distance and proportion of intercolumnar distance and column-height, the architectural type of this building is similar to nearby Sinhung-sa Daekwang-jeon. This was because the identical monk-craftsmen carried out the many constructions of nearby temples with their architectural skills at the same period. Third, in particular, the style and created-time of the front gongpos are different from those of the rear gongpos. That is why the front gongpos were replaced when Unsoo-sa Daeoong-jeon was reconstructed in 1771.