A floor board includes a board unit that includes a substrate and a coating unit. The substrate has a first side surface, a second side surface opposite to the first side surface, a male engaging part extending outwardly from the first side surface, and a female engaging part indented inwardly from the second side surface. The male engaging part corresponds in shape to the female engaging part. The coating unit is formed on the first and second side surfaces, and the male and female engaging parts, and includes a far-infrared radiating material.
