The term "nodachi" refers to a type of Japanese sword that is characterized by its long blade. The size of a nodachi can vary, but it generally refers to a sword with an exceptionally long blade, often exceeding 90 centimeters (35 inches) and sometimes reaching over 100 centimeters (39 inches).

While there are historical accounts and depictions of nodachi swords, it is challenging to pinpoint the specific "biggest" nodachi in the world, as it would require identifying a well-documented and measured sword of significant size.

It's worth noting that nodachi swords were primarily used in ancient and medieval Japan and fell out of favor as the country's battlefield tactics shifted towards more compact and versatile weapons. Surviving examples of nodachi swords can be found in museums or private collections, and they are appreciated for their historical and artistic value.

If there were to be a nodachi considered the "biggest" based on its length, it would likely be an exceptionally long and rare specimen. However, without a specific record or measurement, it is challenging to identify a single nodachi as the largest in the world definitively.