The earliest surviving description of the church, from 1583, records that it had a reasonably strong wall but that the interior was badly decayed—a state that had not improved by the late 1600s, when a much-needed renovation took place. The church is thought to be dedicated to Saint Olaf, Norway's patron saint, a link suggested by a surviving 13th-century wooden sculpture of him, now held on deposit at Borås Museum. The building also contains a seated Madonna figure carved in oak in the early 1200s, and a plain sandstone font from around the same period, its cylindrical basin left entirely undecorated.
Originally the church consisted simply of a nave without a distinct chancel. A significant remodelling in 1820 broke down the eastern wall, extending the interior and creating a three-sided chancel, though funds ran short and the work was completed only in stages; a sacristy was added at this time, and the roof over the older part of the church was later raised to match the height of the new chancel roof. In 1909 a new floor and new pews were installed. Sources differ slightly on the date of the granite tower that replaced the old wooden bell-frame—one account gives 1909, another 1913—but both agree the tower was built in a Romanesque style at the west end, and that the earlier timber bell-frame was sold and now stands in Ramnaparken in Borås.
A further renovation in 1956–1957 uncovered older wall paintings and introduced a new stained-glass window in the chancel by the artist Einar Forseth, divided into twelve scenes from the life of Christ. The window attracted international attention and was reportedly exhibited in London in 1956.
Among the furnishings, the three-tiered pulpit dates from the early 1600s. The church's bells were recast and renewed in the early twentieth century. The main organ today is a digital instrument, though an earlier pipe organ built in 1930 by Hammarbergs Orgelbyggeri survives alongside it.
Öra kyrka and its churchyard also have a small place in Swedish film history, having served as a location for Colin Nutley's films Änglagård and Änglagård – andra sommaren, with several local parishioners appearing as extras.