Tanjiro Kamado's sword in "Demon Slayer: Kimetsu no Yaiba" is a Nichirin Blade. Nichirin Blades are special swords used by Demon Slayers in the series. Each Nichirin Blade possesses a distinct color and pattern that corresponds to the unique abilities of the wielder.

Tanjiro's Nichirin Blade has a black blade and a silver guard. The sword's color and design reflect his unique skills and background as a Demon Slayer. Tanjiro's sword plays a significant role in his battles against demons as he harnesses his training and techniques to fight with it effectively.