At the southern end of the nave, two large arcades lead to the Chapelle du Pénity where the tomb of Saint Ronan is located.
Inside the Saint-Ronan church there is the Rosary altarpiece, the work of the Landerneau painter and sculptor Maurice Le Roux and dating to 1668.
The 1707 pulpit is the work of the carpenter Louis Bariou and the sculptor Guillaume Le Poupon, and is decorated with médaillons depicting scenes from the life of Saint Ronan.
The baptismal fonts are carved from granite and date to the fifteenth century and the church has organs installed by Thomas Dallam in 1672.
It has marmosets carved half way up the shaft of the cross and at the top the crucifix is reversed with a depiction of the resurrected Jesus.
The altarpiece with twisted columns on either side is decorated with fifteen miniature medallions telling the story of the "mysteries of the Rosary".
This window dates to around 1480 and tells the story of the passion in a total of 17 tableau with the Marquis de Nevet depicted in the final panel.
The window has a statue of John the Evangelist and the Virgin Mary on either side, these in polychromed wood and dating to the seventeenth century.
In the chapelle du Pénity is a flagstone carved in kersanton stone by the Folgoët atelier for the tomb of Saint Ronan.
The bell tower is of eighteenth-century vintage and the calvary and fountain date to 1698 and were dedicated to the hemp merchant J.Conan.
[7] The chapel has a limestone calvary which is 5 metres high and features two angels collecting the crucified Jesus' blood.
In the Pénity version, Nicodemus holds the crown of thorns but this has broken off and is missing in the Notre-Dame-de-Bonne-Nouvelle work.
On the front of the pedestal at Pénity are two bas-reliefs carved from kersanton stone, these depicting the resurrected Jesus meeting with Mary Magdalene and the disciples at Emmaus.