There is provided a buildup device that builds up a plate-shaped core after rotating the core by a predetermined angle, and that includes a servomotor, a damping plate attached to the servomotor, at least one upper plate provided above the damping plate, at least one lower plate provided below the damping plate, and a plurality of vibration absorbing members attached to the damping plate. The upper plate and the lower plate restrict a degree of freedom of vibration to one direction, and the vibration absorbing members absorb vertical vibration.