He assumed the position upon the death of his predecessor, József Antall, and held the office until his right-wing coalition was defeated in election by the Hungarian Socialist Party (MSZP), which was led by his successor Gyula Horn.

[5] As a result of the Soviet invasion during the closing period of the Second World War, the entire cadet school moved to Sopron at the end of 1944.

[6] Boross finally took his school-leaving exam at Somssich Pál Secondary Grammar School in Kaposvár in 1947, with a year delay due to the Second World War.

[8] After finishing legal education, Boross intended to become a lawyer, however the reputation and salary of the profession reduced during the Stalinist era, thus he began to work at the Metropolitan Council of Budapest.

Through the intercession of József Venesz, the most well-known chef in the Kádár regime, Boross was promoted to Deputy Director of the South-Pest Catering Company in 1965.

[22] After the resignation of Balázs Horváth following the flawed management of the taxi drivers' anti-government blockade, Boross was appointed Minister of the Interior on 21 December 1990.

In a later interview, Boross said that he considered Ferenc Keresztes-Fischer, the Interior Minister during the Horthy era, who acted against both the far-right and far-left movements, as his role model.

[20] As minister, Boross reorganized the structure of law enforcement organizations and dismissed Győző Szabó, the Chief of the National Police.

[24] His ministry has also developed the municipal law; Boross was advocate of more extensive decentralization, but the majority of his party rejected his amendment proposal.

[25] When protesters hissed and booed President Árpád Göncz (SZDSZ) on 23 October 1992, Boross and the government were accused of deliberate sabotage by the opposition.

A day before his death, as a result of Boross' proposal, Antall was awarded Grand Cross of the Hungarian Order of Merit by President Árpád Göncz on 11 December 1993.

On the following day, the Hungarian Democratic Forum's national board and the parliamentary group jointly convened, where three candidates, Péter Boross, Iván Szabó and Lajos Für ran for the position of prime minister.

[30] In January 1994, Boross met with leaders of the Central-European post-communist countries in Prague, reflecting the 1994 Brussels summit where the United States expressed its intention to enlarge the NATO intergovernmental military alliance.

Before the 1994 election, Viktor Chernomyrdin, the Prime Minister of Russia visited Budapest to discuss the issue of debt settlement.

[31] In February 1994, Boross visited France where he held talks with President François Mitterrand and Prime Minister Édouard Balladur.

Although the MSZP had more than enough seats to govern alone, Horn wanted to allay concerns both inside and outside Hungary of a former Communist party winning an absolute majority.

With this in mind, he went into coalition with the liberal and previously strong anti-communist Alliance of Free Democrats (SZDSZ), giving him a two-thirds majority.

Boross served as political advisor to Prime Minister Viktor Orbán, whose party the Fidesz won the 1998 election; the MDF was also involved in the government as a coalition partner.

[36] Since then Boross was long considered a supporter of Minister of Justice Ibolya Dávid, who became leader of the MDF in January 1999, replacing Sándor Lezsák.

[35] Before the election's second round, Boross argued the left-liberal MSZP–SZDSZ governing coalition's advantage is unbeatable, therefore he received much criticism from the right-wing intellectuals.

Boross was strongly opposed to the nomination of Socialist ex-minister Lajos Bokros to the head of the MDF party list during the 2009 European Parliament election.

[42] On 6 June 2010, following the 2010 parliamentary election, when Fidesz won a two-thirds majority, he became a member of the board advising Prime Minister Viktor Orbán on the conceptual foundations of the new Hungarian constitution.

[45] In August 2015, reflecting on the European migrant crisis, Boross claimed the mass immigration into Hungary was an "issue of race and ethnicity".

[48] The NMHH did not consider Boross' remarks as exclusionary thus terminated the authority procedure in the absence of infringement against the former prime minister in February 2016.