To provide a stable apparatus for producing a thermoplastic resin pipe fitted with a lateral groove, constituted so that a form part and a half element respectively preceeding in a production direction become a contact state and having a simple structure.

A bridge crane type feed apparatus 29 is formed so as to have a feed bridge 34 runnable in a production direction and going over a molding section to extend, the feed trucks 44, 45 arranged to the feed bridge 34 and runnable laterally with respect to the production direction in mutually reverse directions and a feed arm equipped with the fixing device 54 attached to the feed trucks 44, 45 and fixing form part half elements 4, 5 respectively and turned downwardly with respect to a foundation plate 1.