To provide an exciter of a slide mass type that employs a new driving device, is decomposed and simplified, and is easily carried.

The exciter of the slide mass type comprises a hollow box body 2, a movable body 3 having many spindles 8 stored in the box body 2, a linear motor 12 for reciprocating the movable body 3 in the box body 2, and controlling means 20, 22 and 23 for controlling the amplitude and frequency of the movable body 3.