Embodiments of the present invention relate to a burner apparatus. The burner apparatus, which raises the temperature of exhaust gas, comprises: an outer housing; an inner housing having one end portion thereof distanced apart from one end portion of the outer housing and disposed inside the outer housing and the other end portion thereof supported on the other end portion of the outer housing, the inner housing forming a combustion chamber; a porous member disposed between the one end portion of the outer housing and the one end portion of the inner housing; a first supporting member separating and supporting the inner peripheral surface of the outer housing and the outer peripheral surface of the inner housing; and a second supporting member separating and supporting the porous member and the inner housing.