A combustion device comprises a burner and a fragrance diffuser. The burner is provided with a top end having a combustion portion. The fragrance diffuser includes a support and a holder adapted to hold a fragrance substance. The support is disposed on the top end and has an inner wall and an outer wall. The inner wall is arranged around the combustion portion, and the outer wall is arranged around the inner wall. A holding space is formed between the inner wall and the outer wall. The holder is disposed in the holding space. Thus, the combustion device is not only for decorative purpose, but also able to emit fragrance. Further, the fragrance diffuser can function as a windshield of the burner.