A gas burner apparatus comprising: a first burner to receive supplied gas mixed with a first primary air from a first primary air supply flow path and to inject flames through a plurality of first burner ports formed along an edge of the first burner; a second burner, spaced apart from a lower side of the first burner and including an upper side, to receive the supplied gas mixed with a second primary air from a second primary air supply flow path and to inject flames through a plurality of second burner ports (135, 137) formed along an edge of the second burner; a support plate spaced apart from a lower side of the second burner; and a secondary air supply flow channel (S1, S3, S4) to supply secondary air to the first burner, wherein the secondary air supply flow channel (S1, S3, S4) comprises: a first secondary air supply flow path formed between the first and second burners; a third secondary air supply flow path formed inside the second burner and connected to the first secondary air supply path; and a fourth secondary air supply flow path formed between the second burner and the support plate and connected to the third secondary air supply path; characterized in that, the secondary air supply flow channel (S1, S3, S4) further comprises a second secondary air supply flow path starting from an area lower than the support plate and connect to the first secondary air supply flow path. a first burner to receive supplied gas mixed with a first primary air from a first primary air supply flow path and to inject flames through a plurality of first burner ports formed along an edge of the first burner; a second burner, spaced apart from a lower side of the first burner and including an upper side, to receive the supplied gas mixed with a second primary air from a second primary air supply flow path and to inject flames through a plurality of second burner ports (135, 137) formed along an edge of the second burner; a support plate spaced apart from a lower side of the second burner; and a secondary air supply flow channel (S1, S3, S4) to supply secondary air to the first burner, wherein the secondary air supply flow channel (S1, S3, S4) comprises: a first secondary air supply flow path formed between the first and second burners; a third secondary air supply flow path formed inside the second burner and connected to the first secondary air supply path; and a fourth secondary air supply flow path formed between the second burner and the support plate and connected to the third secondary air supply path; characterized in that, the secondary air supply flow channel (S1, S3, S4) further comprises a second secondary air supply flow path starting from an area lower than the support plate and connect to the first secondary air supply flow path. a first secondary air supply flow path formed between the first and second burners; a third secondary air supply flow path formed inside the second burner and connected to the first secondary air supply path; and a fourth secondary air supply flow path formed between the second burner and the support plate and connected to the third secondary air supply path; characterized in that, the secondary air supply flow channel (S1, S3, S4) further comprises a second secondary air supply flow path starting from an area lower than the support plate and connect to the first secondary air supply flow path.