To obtain a vaporizer in which thin film-forming raw material solutions are stably and reliably carried by a carrier gas while being reliably separated within the dispersion unit body and the plurality of thin film-forming raw material solutions are stably vaporized in the subsequent vaporization unit, a center rod used in the vaporizer, and a method for vaporizing raw materials entrained by a carrier gas. A carrier gas introduction bore is formed in the center axis direction of the dispersion unit body. A center rod is inserted in the carrier gas introduction bore. The interspace between the inner wall of the bore and the outer wall of the rod forms a gas passage. Multiple thin film-forming material supply units are situated midway of the gas passage of the dispersion unit body, supplying thin film-forming materials. The center rod has sealing members in the longitudinal direction of the center rod.