A descendant of the Bourbon dynasty, Prince Juan Carlos was appointed by the Spanish dictator Francisco Franco to succeed him in power in order to perpetuate Franco's political system. In this context, the main objective of this doctoral thesis is to highlight, through a hemerographic perspective - more specifically from the following newspapers: La Vanguardia, ABC and El País - the evaluation of the political commitment of King Juan Carlos during this period of transition. This research has allowed us to reach the conclusion that these newspapers showed a positive assessment of the role of the Spanish Crown during the transition process. However, there were certain discrepancies with respect to some royal decisions, such as the appointment of Adolfo Suárez as President of the Spanish government.