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Inlägget är dock från 2010
Section 371 of the Thai Criminal Code prohibits openly carrying arms to a public place or carrying them to a gathering of people assembled for any purpose. One can be arrested and convicted with a small fine for this, and the weapon confiscated. The word "arms" in section 371 includes all weapons such as hunting knives, clubs, nightsticks, machetes and firearms. It also includes anything not necessarily intended to be used as a weapon, but that can be, such as a golf club or a rolling pin.
There is no law that would prevent you from having them in the home and using them as protection from intruders. Please remember, though, that there are limits on how these weapons can be used, even in the home. Section 371 does allow for carrying concealed arms in public places with "reasonable cause", which would be defined on a case-by-case basis. This is, however, a very limited exception. Examples of this reasonable cause would be:Transporting arms to be used for sport;keeping arms in the car while transporting large amounts of cash;arms transported along with other household goods as part of the process of moving.
https://www.thaivisa.com/forum/topic/406371-legal-knife-length-in-Bangkok/