Combustion device and water heating device comprising same

A combustion device C is provided with: a combustion unit 4 for combusting a fuel gas; a mixed gas supply path (3) for supplying a mixed gas of fuel gas and air to the combustion unit (4); and a flame sensor (5) which is provided so as to be positioned in or face the mixed gas supply path (3) and which is capable of optically detecting a flame of tempering when tempering is generated from the combustion unit (4) to the mixed gas supply path (3), the combustion device (C) being further provided with a shielding unit (6) for shielding the flame of the tempering from the combustion unit (4) to the mixed gas supply path (3). The shielding part (6) prevents the light of the flames of tempering and the flames during normal combustion from traveling from the combustion part (4) to the flame sensor (5). By means of the above-mentioned content, it is possible to eliminate erroneous detection of tempering, improve the detection accuracy of tempering, and appropriately suppress the malfunction of thermal damage to compo