Horizontal vibrating bran finisher is used for separating flour that sticks on bran surface in grinding part. Bran together with sticking flour is fed from the machines entrance. With blades attached to the eccentric rotor vibration is formed and bran hitting to each other and to sieve surface leaves the flour sticking to it. The process is repeated continuously. Bran particles are fed to requested place through bran exit of the machine. Sifting rate is increased by preventing bran flow through the rotor.