Abstract: Nigeria returned to democratic rule which is anchored on the presidential system in 1999. There are three institutions established to achieve smooth running of the presidential system namely: The Legislature, The Executive and The Judiciary. The study of government under democratic setting will be impossible without appreciating the role of the legislature. Under the third wave of democratization, legislative power and roles cannot be underrated. In many democracies both advanced and developing, legislative institution is becoming increasingly noticeable and self-confident in the political processes. The primary or core functions of the legislature include representation and law-making. It is worthy to note that the 1999 constitution establishes two chambers for the country. However, the nature and workability of inter-chamber relations has been given less attention. This study examines the reasons for the adoption of a bi-cameral legislature in Nigeria. What are the relationships between the two chambers (House of Senate and House of Representatives)? What is the position of the constitution on inter-chamber relations? These are some of the questions the study will seek to answer in the current Nigeria’s Fourth Republic. The study makes use of secondary source and the author personal experiences in the political theater of Nigeria. The study argues that the superiority of the Senate over House of Representatives is historical. The study concludes that the existence of parallel roles of the two chambers must be religiously followed to avoid leadership clashes.