In this poster, we introduce the activities of constructing a data catalog for the humanities and social science (HSS) in Japan. Japan Society for the Promotion of Science (JSPS) started the project of data infrastructure for the HSS in 2018. One of the aims of this project is to build an infrastructure for sharing Japanese HSS research data among researchers across research fields and countries. JSPS and National Institute of Informatics (NII) are trying to construct a data catalog that can retrieval SSH data owned by several research repositories according to the purpose of researchers. We collaborated with four research institutions that have distinctive SSH data and surveyed the metadata used by each institution. As a result, we adopted DDI-Codebook as common metadata for our data catalog from the viewpoint of machine-readable and interoperability. Currently, we are defining the mandatory items elements and controlled vocabulary for this metadata in consultation with each organization. We plan to collect the metadata of each institution via OAI-PMH using JAIRO Cloud, the institutional repository service provided by NII and provide these metadata to international institutions in the future.