Gas burner

A gas burner comprising

• a main burner for cooking food,
• a catalyzer for absorbing smoke, odor and other gases contained in combustion exhaust gas,
• an after burner positioned at a lower level than the catalyzer and located in a position upstream of the catalyzer for activating the catalyzer to burn out smoke, odor and other gases contained in the combustion exhaust gas, and
• a fire guide, said main burner, after burner and fire guide being formed as an integral unit, said main burner and said after burner each having a porous flame plate through which gas passes to form a combustion area, and wherein the fire guide is formed on a boundary between the porous flame plate of said main burner and the porous flame plate of said after burner.