This new division included the creation of a parish, claimed for years by locals in the southern part of the city, which later became known as the "Ensanche of Amara".

In August 1887 the City Council gave an area between the river Urumea and Beach of La Concha, occupied by sand dunes and marshes, to build the church.

In December 1887 a construction meeting chaired by the Dean D. Martín Lorenzo de Urizar Zalduegui-Ariño defined the bases of the project competition and set a budget of 750,000 pesetas, and like the capacity of the church and its architectural style, it should be pointed.

The queen regent, Maria Christina, her children and the Infante Antonio, along with ministers and other officials, attended the solemn mass that the diocesan bishop D. Mariano Miguel Gómez held in the provisional parish church of the Sacred Heart.

The minutes of the ceremony were signed by the baby king Alfonso XIII, aged two years and four months, for which his mother had to take his hand.

[citation needed] For the size of the stone of the capitals, ornaments, windows and needles that decorate the interior and exterior, the models presented by the local artist Julio Gargallo were accepted.

On July 30, 1953, finally, the church achieved the rank of Cathedral with the consecration of the new altar, acting as pastor D. Ignacio Lasquibar Olaciregui, who in 1954 took over from D. Román Mendiguchia.

For this the presbytery was transformed with the installation of a new table after the removal of the original altar, of a florid Gothic style, carved in cedar wood by the Barcelonese workshops of Juan Riera, it was replaced by choir stalls and an image of the Good Shepherd.

The naves up to the crossing, of which the wider and the highest is the central, are segmented into five rectangular sections covered with four-parts vaults of simple ribbing.

The Main Chapel, since the reform of 1972, appears austerely furnished by choir stalls worked by the Goicoechea y Arín workshop of Vitoria.

On it, resting on a pedestal that hangs from the central boss of the apse, the sculpture of the Good Shepherd, which was on the original Neo-gothic altar.

Under the rose windows of the transept the initial design included two small pedestrian doors that were finally replaced by two altarpieces, of Neo-Gothic style and gold-covered, these were placed as the devotions of the Sacred Heart of Jesus and the Immaculate Conception of Mary.

Other items of interest are the altars and shrines of the Holy Family, Our Lady of Mount Carmel, Saint Anthony and Francis of Assisi, works by Julio Gargallo.

The cathedral's stained glass was designed by Juan Bautista Lázaro and made by the workshop of Bolinaga and Cía., from León, and Pujol, from Barcelona.

The choir organ houses in its interior and exterior 9,535 pipes, the largest measures 10 meters, the whole thing weighing 30 tons.