To effectively improve heat efficiency by exhaust gas by reducing fluid resistance by a trivet.

The trivet 5 is composed of a plurality of L-shaped trivet claws 24 radially arranged in a plane direction, and a disc-shaped trivet ring 25 on which the trivet claws 24 are stood and which has an opening at its center, and the trivet 5 is set on a position concentrically to a main body part 11 of an inward flame hole burner 4. The trivet claws 24 are respectively composed of a horizontal part 25 kept into contact with a bottom part of a cooking container P, and a vertical supporting part 27 for supporting the horizontal part 26 on the trivet ring 25. The horizontal part 26 has the plate-shape having a thickness in the vertical direction smaller than a width in the circumferential direction of the trivet ring 25, its upper face is flat to be closely kept into contact with the bottom part of the cooking container P, and its lower face is formed into the circular arc-shape thickest at its center and gradually thinned toward an end part in the width direction.

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