The symbol of the Parliament is an oaken sculpture by Nestor Basterretxea representing a stylized tree, an allusion to the tradition of Basque political assemblies meeting under a tree, as in Guernica.

It is composed of seventy-five deputies representing citizens from the three provinces of the Basque autonomous community.

Each province (Álava, Gipuzkoa and Biscay) elects the same number of deputies, despite their having very different levels of population.

This was chosen to earn support from Álava and Navarre, less populated territories.

The Parliament consists of 75 deputies elected by universal adult suffrage under a system of proportional representation.