This paper points out the difficulties of the project which considered bioethics as an “applied ethics” as well as on the identity of bioethics as an interdisciplinary discipline rather than as a division of ethics. Further this paper emphasizes that bioethics should deal with fundamental questions about some basic concepts and orientations presupposed in a discipline relevant to bioethics, such as philosophy, medicine, biology and jurisprudence. For bioethics as an interdisciplinary discipline, it is an improper expectation that philosophy will provide the definite ethical answers to bioethical issues. Philosophy plays a role to provide various perspectives, ways of thinking, and arguments which should be considered and reviewed for a social consensus. The ways of discourse in which philosophers argue their argument for their own ethical opinions on particular bioethical issues should be changed because we need bioethics that may work in a pluralistic society where there is not the only right theory of normative ethics. Philosophy should deal with philosophical issues relevant to reaching a social consensus for a new bioethics working in a pluralistic society. Philosophy should inquiry criteria to discern reasonable disagreement from other disagreement, methodologies to make our group communication and discourse reach ethically true or justified beliefs, and philosophical status of such beliefs. In addition, philosophy has a task to study basic concepts such as human dignity, respect for human life, the value of life, the quality of life, human identity, etc., which are frequently used in bioethical discourses.