The X-ray analyzing apparatus according to the present invention includes, in combination: a first correcting unit (13A, 13B) to output a first gain to cause a pulse height of a target peak which is estimated on the basis of a sum of counting rates obtained in preliminary measurement, to match a predetermined expected pulse height; and a second correcting unit (14A, 14B) to output, in real time through feedback control, a second gain to be added to the first gain in order to cause the pulse height of the target peak detected within a predetermined energy range, to match the expected pulse height, and further includes a feedback control stopping unit (16A, 16B) to appropriately determine presence/absence of an interfering line with respect to the target peak, and to set, when determining that the interfering line exists, the gain to a fixed value including only the first gain.