Niger's new constitution was approved in July 1999. It restored the semi-presidential system of government of the December 1992 constitution (Third Republic) in which the president of the republic, elected by universal suffrage for a five-year term, and a prime minister named by the president share executive power. As a reflection of Niger's increasing population, the unicameral National Assembly was expanded in 2004 to 113 deputies elected for a 5 year term under a majority system of representation. Political parties must attain at least 5% of the vote in order to gain a seat in the legislature.

The constitution also provides for the popular election of municipal and local officials, and the first-ever successful municipal elections took place on July 24, 2004. The National Assembly passed in June 2002 a series of decentralization bills. As a first step, administrative powers will be distributed among 265 communes (local councils); in later stages, regions and departments will be established as decentralized entities.

A new electoral code was adopted to reflect the decentralization context. The country is currently divided into 8 regions, which are subdivided into 36 districts (departments). The chief administrator (Governor) in each department is appointed by the government and functions primarily as the local agent of the central authorities.

The current legislature elected in December 2004 contains seven political parties. President Mamadou Tandja was re-elected in December 2004 and reappointed Hama Amadou as Prime Minister. Mahamane Ousmane, the head of the CDS, was re-elected President of the National Assembly (parliament) by his peers. The new second term government of the Fifth Republic took office on December 30, 2002. In August 2002, serious unrest within the military occurred in Niamey, Diffa, and Nguigmi, but the government was able to restore order within several days. In June 2007, Seyni Oumarou was nominated as the new Prime Minister after Hama Amadou was democratically forced out of office by the National Assembly through a motion of no confidence. From 2007 to 2008, the Second Tuareg Rebellion took place in northern Niger, worsening economic prospects and shutting down political progress.

On the 26th May 2009, President Tandja dissolved parliament after the country's constitutional court ruled against plans to hold a referendum on whether to allow him a third term in office. According to the constitution, a new parliament will now have to be elected within three months.