This doctoral research thesis is founded on the three-dimensional concept of justice developed by contemporary philosopher of critical theory Nancy Fraser. The objective is to investigate the impact that the Bolsa Família Program (PBF) generated in the reduction of social inequalities in the lives of beneficiary families considering aspects of redistribution, recognition and equal participation. An literature review of research was conducted on the Bolsa Família Program from 2003 to 2014. The theoretical path of this thesis aimed the investigation of the concepts of poverty and social exclusion, the analysis of the Brazilian development process and the public policies for dealing with social inequalities from the 60 s to the 90 s also focusing on the democratic transition experience post-constitution of 1988. We took into account the constitutional principles of 1988 and international treaties that support the responsibility of the Brazilian State and society to the implementation of social policies such as the Bolsa Família Program. We concluded that the PBF produced important results in the lives of the beneficiaries, ensuring redistributive and recognition justice, empowering those people to participatory parity as integral individuals in society. We recognize the progress of the institutional design of the Brazilian social policy, provided by the PBF, starting a new model of social protection, able to identify the social vulnerability of the Brazilian families in state of poverty and to articulate the redistribution of income and the recognition by the Single Social Assistance System - Suas.