To provide a manufacturing method for obtaining an optical fiber preform having high uniformity of glass fine particle deposition magnification in the longitudinal direction.

In the method of manufacturing the optical fiber preform by depositing glass fine particles on the outer circumference of a rotating target rod while, for example, back and forth moving three burners at prescribed intervals each other, when the distance of the back and forth movement of each of three burners is expressed by LA, LB and LC, the distance of the one-way movement of the burner to become a standard in three burners is expressed LS and the standard movement speed is expressed by VS, the basic movement speed Vn of each burner during the glass fine particle deposition is expressed by Vn=(Ln/LS)VS. When the distance between the standard burner and the other burner exceeds the previously fixed upper limit or lower limit, the movement speed of the burner exceeding the limit is adjusted so that the distance between the burner and the burner to become standard is adjusted to be within a range from the upper limit to the lower limit.