This paper seeks to examine the capability approach in a philosophical way with particular regard to the claims and features that might justify it as an approach to social justice. It is concerned what individuals are able to do and be, or what may be more accurately referred to as their true freedom. It puts individual first. Human development has been pioneered by various persons at various eras and under various titles. Amartya Sen’s capability approach, which he pioneered, has set a new standard for human development analysis. Although Sen pioneered the approach, Marta C. Nussbaum carried it to a higher level, making it applicable to a wider range of fields beyond welfare economics. This paper is entirely focused on Sen and Nussbaum’s perspectives. Along with this, it aims for a comparative study of Sen and Nussbaum’s perspectives on capability approach. In this paper, I shall represent how they defend the premise that social justice consists in establishing the best possible conditions for all people to realise their basic potential.