Burner assembly for a gas burner of radiant heating type including a burner chamber (140) for receiving mixed gas, a burner mat (150) on top of the burner chamber (140) for making combustion, and a baffle part (161,163) between a bottom of the burner mat (150) and a side of the burner chamber (140) the mixed gas is introduced into the burner chamber (140) therethrough, for uniform distribution of the mixed gas to an entire part of the burner mat (150).