Abstract: A treatment apparatus includes a feeding device and a laser device. The feeding device includes a feeding rotor and a motor. The feeding rotor is rotatably supported. In the outer peripheral surface of the feeding rotor, a support portion extending in a circumferential direction of the feeding rotor is formed, and holding grooves are formed in the support portion at equal angular intervals. The laser device treats the element body fed to a treatment position. A control device controls the motor so as to stop the feeding rotor at every predetermined angle (an angle at which the holding groove is formed) and to feed the element body to a treatment position. Then, the control device controls the laser device so as to treat a surface of the element body.