To provide an exciter the maximum frequency of which can be raised easily.

This exciter 1 is provided with a vibration table (for example, an upper vibration table 22, etc.), a horizontally exciting section 3 which excites the vibration table in the horizontal direction, and a supporting mechanism 4 for horizontal movement which supports the vibration table in a horizontally movable state. A test peace is connected to the upper surface of the vibration table through a connecting shaft 6. The shaft 6 is provided with an elastic member 62 which causes resonance in a prescribed frequency band when the vibration table is excited.