 It consists of a Latin cross plan with three naves with a barrel vault, with five sections, the presbytery is covered with three hemispherical domes.It has an annex where the chapel of the Blessed Sacrament is located.On the main altar you can see a gilded wooden altarpiece, with a carving of the image of the Immaculate Conception made in 1620 by Francisco de Ocampo and donated to the city by King Felipe III of Spain.