Born in San Sebastián on 1 August 1929, Cavero attended Our Lady of Remembrance College, Madrid before commencing studies in law and economics at the University of Deusto.

After joining the Union of the Democratic Centre, Cavero was elected to his first term on the Congress of Deputies as a representative from Madrid.

While serving consecutive terms as a member of the Congress of Deputies, Cavero also held several cabinet positions.

Cavero then assumed leadership roles in the People's Democratic Party and returned to the Congress of Deputies, winning election from Madrid in 1986.

[1] Cavero was named to the Spanish Council of State in 1996, and served until his death on 25 December 2002, of a heart attack at Clínica de La Luz in Madrid.