A radiation analyzer includes a primary ray source that generates primary rays, an optical system applies the primary rays emitted from the primary ray source to a sample, an energy-dispersive radiation detector that detects radiation that has been generated from the sample when the primary rays have been applied to the sample, and a support that supports the radiation detector so that the tilt of the center axis (C) of the radiation detector with respect to the optical axis (Z) of the optical system can be changed.