The aim of the invention is to improve a conventional formwork device. According to the invention, a formwork device is provided for producing components, in particular precast concrete parts, wherein the formwork device has two formwork panels which can be hinged together preferably in a releasable manner in order to be converted from an unfolded state into a folded state. Each formwork panel has a formwork front face and a formwork rear face, and the formwork rear faces of the two formwork panels face each other in the folded state. A formwork chamber which can preferably be closed by a cover is provided at least on one of the formwork front faces for filling with a fluid that can be hardened, preferably concrete. The invention additionally relates to a method for producing a precast concrete part using a formwork device according to the invention.