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Synopsis: Thin and lightweight structural concrete can be achieved by using fiber reinforced Porosity Free Concrete, which has extremely high compressive strength exceeding 300 N/mm 2 . In this study, to investigate the structural behavior of thin and lightweight prestressed segmental concrete beams using externally prestressed fiber reinforced Porosity Free Concrete, bending tests on beams with high prestress were conducted. In these experiments, the loading capacity of a fiber reinforced Porosity Free Concrete beam with 40 N/mm 2 prestress was dramatically improved compared with a beam with 20 N/mm 2 prestress. The analytical results obtained with the non-linear finite element method showed good agreement with the experimentally obtained yielding capacity. Prestressed concrete members consisting of thin thickness fiber reinforced Porosity Free Concrete segments were found to have potential for use in concrete structures through the application of high prestress.