An analytical device includes: a reaction unit into which an ion derived from a sample component is introduced; a radical generation unit that generates a radical by vacuum discharge and comprises a raw material introduction chamber into which a plasma raw material is introduced; a connection part that introduces the radical generated in the radical generation unit into a vacuum chamber, the vacuum chamber having a pressure lower than a pressure of the raw material introduction chamber and being connected to the reaction unit; and a separation unit that separates a generated ion generated by a reaction with the radical introduced via the connection part into the reaction unit according to m/z and/or ion mobility, wherein an inner diameter of a cross section of the connection part is equal to or less than 20 millimeters.