Like most churches in the surrounding Kullabygden district, Jonstorps kyrka was built around 1200 and later given star-vaulted ceilings in the 1400s, along with a tower. The nave was unusually large for what was a fairly small rural parish, hinting at greater ambitions or a wider role in its early history.
Several details suggest the church was once dedicated to Saint Olaf, a hugely popular medieval cult figure across Scandinavia as well as Norway's national saint. During restoration work in the early 1950s, a small sandstone reliquary was discovered hidden within the remains of an older altar. It contained fragments of linen and silk along with a strip of parchment bearing a Latin inscription linking the contents to Saint Olaf, together with some fragmentary bone material — a rare physical link to medieval relic veneration in the region.
The church's most celebrated furnishing is its 1594 canopied altarpiece in Renaissance style, which art historians have described as without parallel among Skåne's rural churches. It depicts the institution of the Holy Communion, and its inscriptions record the names of the parish priest and churchwardens of the time. The pulpit, from roughly the same period, carries the monogram and motto of the Danish king Christian IV, reflecting the era when this part of Skåne was under Danish rule, along with carved figures of the four evangelists.gaben.
A late-medieval triumphal crucifix, now hung above the font, originally stood in the chancel arch; later conservation removed several later layers of overpainting to reveal what is thought to be its original colouring. The unusual font, carved from a single piece of oak in the late 1940s by the sculptor Ralph Bergholtz, shows New Testament scenes on its bowl and images of local trades — fishing, seafaring, farming and market gardening — around its base. The accompanying brass font dish is considerably older, probably sixteenth century.
A votive ship hanging in the nave represents the brig Hiram, a former mission vessel, donated in 1948 after one of the local Thore shipping family's vessels survived a severe storm. Two earlier votive ships have had a more complicated history, passing between the church, a private owner and Höganäs museum before being returned to the parish. The churchyard, close to the sea, contains many graves of sea captains, and the Swedish film actor Edvard Persson is buried here.
The present organ was built and installed in 1963 by the Copenhagen firm Poul-Gerhard Andersen, replacing earlier instruments recorded from 1827 and 1927. In the north-west corner of the old churchyard stands a small mortuary chapel; though parish records date it to 1866, parts of the structure appear to be medieval, possibly originating as a gatehouse to the churchyard.