A permanent casting mould for casting cast parts, in particular cylinder heads, from a molten metal, in particular a molten light metal, includes at least one mould body, which at least partially surrounds a mould cavity reproducing the cast part to be cast and, in the wall of which limiting the mould cavity, a receiver is formed having a shoulder passing into the mould cavity and including a casting mould insert seated in the receiver, which has an upper side associated with the mould cavity surrounded by the respective permanent casting mould, a base body seated in the receiver with play when the casting mould is cold and a support collar which extends over a fraction of the height of the base body of the casting mould insert and is seated with positive fit in the shoulder of the receiver.