The Kingdom of Belzerg (ベルゼルグ王国) is the country that nearly all of the events Kono Subarashii Sekai ni Shukufuku wo! story take place in.
As the Kingdom of Belzerg is the only country whose borders overlap those of the Demon King's Territory, their border is heavily protected. In order to help them, surrounding countries send soldiers to join the border guard, with Elroad being the only exception, assisting with defense costs instead because of their country's wealth.
- Belzerg was unnamed until volume 10.
- In the original Japanese pronunciation, "Belzerg" deliberately sounds similar to the work "berserk". The country is considered to be full of barbarians by many citizens of foreign nations, such as Elroad.