A halogenated alkene compound and a fluorinated alkyne compound are obtained at a high conversion rate and high selectivity by employing any of the following methods (1) to (4):



(1) a halogenated butane compound represented by CX1X2X3CHX4CFHCX5X6X7, wherein X1, X2, X3, X4, X5, X6, and X7 are the same or different and each is a halogen atom, to a dehydrofluorination reaction;
(2) a halogenated butene compound represented by CX1X2X3CX4═CHCX5X6X7, wherein X1, X2, X3, X4, X5, X6, and X7 are as defined above, to a dehydrohalogenation reaction;
(3) a halogenated alkane compound represented by CHX8A1CHX9A2, wherein A1 and A2 are each a fluorine atom or a perfluoroalkyl group, and X8 and X9 are the same or different and each is a halogen atom, to a dehydrohalogenation reaction in the presence of a catalyst in a gas phase; and
(4) a halogenated alkene compound represented by CX8A1=CHA2, wherein A1, A2, and X8 are as defined above, to a dehydrohalogenation reaction in the presence of a catalyst.