Built by organ maker Pedro Roqués of Zaragoza at a cost of 35,375 reales. This is an interesting instrument from a historical perspective given that elements of the baroque can be appreciated such as the fact that most of the stops are still divided, there are several Trompetería de Batalla stops; it has classical-type acoustics and a decoration of the wooden pipes with faces characteristic of the baroque. Together with these elements, there are others which later became to be regarded as belonging to the organs of the romantic period, especially the separate console, the appearance of non-divided stops, a lever to operate or annul the reeds and another to operate the Swell Organ. It is interesting to note that, in 1856, six years prior to the inauguration of this instrument, the very first romantic organ in Spain was installed in Lekeitio (in the Basque province of Bizkaia) and, the year after this inauguration (1863), a great Cavaillé-Coll installed in the church (now basilica) of Santa María in San Sebastián, the capital of the Basque province of Gipuzkoa.

It was restored in 1984 by José Antonio Azpiazu.