A pneumatic linear vibrator comprises a piston guide sealed on one side and delimited by detachable end parts, a piston, a sound-absorbing pipe which forms the housing, and means for supplying and removing a gaseous or vaporized pressure medium. Relative motion between the guide with the end parts and the piston is ensured by automatic alternating delivery of the pressure medium to a working volume (V,V1,V2) located on one face of the piston. The piston has a longitudinal axial bore with a snap ring groove in the region of the ends of the longitudinal median plane of the piston. The snap ring grooves are connected to a face of the piston by at least two axisymmetric channels which run in the axial direction (A) and are sealed off from the longitudinal axial bore of the piston. A guide pipe for delivery of the pressure medium, which is closed at one end, penetrates the end parts and the longitudinal axial bore of the piston in a sealed manner. The guide pipe serves as a piston guide and has radially disposed axisymmetric outlet openings for the pressure medium corresponding to the snap ring grooves in the longitudinal axial bore of the piston. The vibrator has a slim, elongated shape and can be used for example for sieves, conveying channels compacting installations and for driving tools.