This dataset contains data of floral and faunal surveys of intertidal zone along the rocky coast of the southeastern part of Osaka Bay, eastern extremity of the Inland Sea of Japan, carried out annually at several stations by Association for the Research of Littoral Organisms in Osaka Bay (OKKJP). The survey is conducted for several hours during the spring low tide at each station, generally with at least 20 participants recording species by visual observation. Summarized data for every five years are published in Shizenshi-Kenkyu, Occasional Papers from the Osaka Museum of Natural History.