This paper analyses the evolution of the electoral use of Instagram in Spain, from its origins as a political communication channel to its current consolidation. A content analysis of eleven variables is applied to the formal, spatial, personal, thematic-discursive and interactive dimensions of the activity carried out on this social network by the candidates for the presidency of the Spanish Government of the parties that ran with the highest vote expectations in the General Elections of December 2015, June 2016 and April and November 2019 (571 posts). The results show the consolidation of Instagram as a political communication tool and the growing interest of the parties in it, as well as the increasing importance of short videos as a format. The electoral use of this social network is carried out with an increasingly mobilising intention, as evidenced both by the themes chosen and, ab...