To prevent a gas fuel jetting part from being choked by dripping liquid fuel from an atomizing cylinder.

A mixed combustion appliance is arranged with an atomizing cylinder 5 dispersing liquid fuel L by rotation on the center P of the axis of rotation in horizontal direction or nearly horizontal direction, atomizing air jet holes 6 atomizing the liquid fuel L by jetting combustion air A1 to the dispersed liquid fuel L in the same direction or nearly the same direction of the direction of the center of a rotating shaft arranged circularly around the atomizing cylinder 5 and gas fuel jetting parts 8 jetting gas fuel G to the atomizing region of the liquid fuel L arranged circularly all around the atomizing air jetting holes 6, wherein the downward side region of the gas fuel jetting parts 8 located on the downward side in the circular direction jet the gas fuel G in the upper direction to the combustion air being jet from the atomizing air jetting holes 6 and the part of the gas fuel jetting parts 8 other than those of the region located downward the gas fuel jetting parts 8 jet the gas fuel in the direction crossing or nearly crossing the center P of the rotating shaft.