The Organ

St. Peter's Church received its first organ in 1786. Siuntio Church was then the first rural parish to have its own organ in the country. The organ was built by organ builder Svahn.

In the fire of 1891, parts of that organ were destroyed, and a decision was made to acquire a new organ from organ builder A.J. Zachariassen. Parts of the 18th-century organ can be found in the Sjundeå local history museum.

The current organ in the church is the third in line, crafted by the organ workshop Paul Ott in Germany in 1971.