A laser optical apparatus which removes speckles from a screen by changing the phase of a laser beam so as to form an image having high visibility. The laser optical apparatus includes an incident unit on which a laser beam is incident;a multichannel connector having at least two channels having different distances of a route of the laser beam incident on the incident unit so that channels emit beams having different phases; and an exit unit from which the laser beam having a phase changed by the multichannel connector is emitted.