The disclosure provides an excitation device capable of suppressing resonance during excitation and reducing the size in a vertical direction. An excitation device (1) includes front and rear mounting plates (5 and 6) having openings (5g and 6g); a base plate (8) arranged below the mounting plates (5 and 6), slope parts (3) to which the mounting plates (5 and 6) and the base plate (8) are fixed; a first roller (17) and a second roller (16) located below the openings (5g and 6g); a hydraulic actuator (12) having a hydraulic cylinder (12a) that excites the second roller (16) in a front-rear direction of a wheel (W); and a bracket (12c) having a lower end fixed to the base plate (8) and an upper end fixed to the mounting plates (5 and 6), and supporting the hydraulic cylinder (12a).