To provide a method of producing a semi-flame retardant wooden board mainly using wooden chips in order to solve such problems that the disposal of wooden chips as waste incurs costs and the disposal is made by incineration causing concern about the environmental load.

The wooden board is obtained by adding an inorganic fibrous non-combustible material and a heat setting resin to the wooden chips, mixing the mixture, molding it, and hardening it by applying heat and pressure, utilizing the characteristics of the wooden chips.