To provide a thread rolling apparatus capable of preventing the occurrence of tip breakage of apex parts of threading portions of a roller form rolling die and a fixed form rolling die.

The thread rolling apparatus is provided with the roller form rolling die 4 and an arc-shaped fixed form rolling die 5 arranged on an outer circumference of the roller form rolling die 4 in an opposing manner. When a bolt material A is rotated and moved between the form rolling dies 4, 5, a thread part is formed on an outer circumferential part of the bolt material A through the rolling form rolling. A first wrapping body 7 which is rotated together with the roller form rolling die 4, and abutted on a thread forming portion 5a of the fixed form rolling die 5 to apply wrapping to the thread forming potion 5a with viscous diamond liquid is provided on the roller form rolling die 4.