The purposes of this research were (1) to produce a pocket book based on comic to be called BUSAPAKSA; (2) determine the appropriateness and quality of pocket book based on comic that had been developed; and (3) to describe the improvement in learning conceptual understanding after using pocket book. The present research employs a Research and Development (R&D) method by developing a model proposed by Borg and Gall (1983). The product was validated by a psychologist, an instructional media expert, and elementary teachers. The product was performed through preliminary, limited, and broader test. The broader testing used one shot case study. The research subjects were 360 fifth grade elementary school students in Brebes, Tegal, and Banyumas regency and Tegal city. The data collection was conducted by using a questionnaire and conceptual understanding test. Results of the study indicated: (1) BUSAPAKSA was a pocket book based on comic that could be used for learning; (2) BUSAPAKSA was quite viable as learning media and of very good quality; (3) The learning conducted using BUSAPAKSA could improve the students' understanding. The results showed that the students' average gain score was classified into medium category.