To secure satisfactory flammability by smoothing the flow of a gaseous mixture in the mixing section of a burner body regardless of a mounting error or the like.

In a range burner 20 having a burner body 21 composed of a throat section 23 and a mixing section 24, the bottom face at the opposite side of the communication side of the throat section 23 in the mixing section 24 is formed with a raised bottom section 37 for guiding gaseous mixtures branched after being made to flow from the throat section 23 to the mixing section 24 to a merging position which is higher than the bottom face at the inflow side for merging the gaseous mixtures.