To provide an aroma diffuser wherein the liquid leakage of aroma oil is prevented.

This aroma diffuser includes: a container body 1 having a container opening part 1a that is an inlet of the aroma oil 100, and filled with an absorbing member into which the aroma oil 100 is impregnated, thereinside; a catalyst combustion body 3 obtained by making a catalyst metal 3b adhere to a base material 3a; and an introduction opening part oppositely communicated with the container opening part 1a. The aroma diffuser includes, near the introduction opening part, an interposition part supporting the catalyst combustion body 3 and making the catalyst combustion body 3 adjacent to the container opening part 1a.