Content analysis of Science textbook is a good method to find out the objective of science education pursued by textbook authors and authorities of education. Japanese 5th grade science textbooks-upper and lower volumes are analyzed. Analysis form is consisted by knowledges and inquiry processes, Knowledge is divided by fact, concept and rule. Inquiry processes is divided by 13 subcategories such as problem cognition, variable control, observation, measurement, prediction, inference. The result of analysis is as follows : 1. In analysis of knowledge, facts are greatly emphasized and a little of concepts and rules are appeared. 2. In analysis of inquiry process, observation, prediction, problem cognition, experimental planning are greatly emphasized. 3. In units of `plant growth` and `dissolution of matter`, observation and prediction are tried to pursue. 4. In units of physical science areas, measurement is appeared more than biological area. 5. In units of `birth of human and animal` and `sun and moon`, knowledge is greatly appeared comparing with other units.