Method for manufacturing optical fiber preform

A method for manufacturing an optical fiber preform, which forms a deposition portion composed of glass fine particles on a glass rod so as to form a glass fine particle deposition, and suspends the glass fine particle deposition vertically into a heating furnace to heat the glass fine particle deposition to transparentize the deposition portion, the method comprising:

• a step of forming a hazy portion, by causing a surface portion of the glass rod to sublime and adhere to at least a portion of a region closer to one end of the glass rod than a region of the glass rod where the deposition portion is formed, before heating said glass fine particle deposition;
• a step of forming the deposition portion by depositing the glass fine particles on the glass rod;
• and
• a step of transparentizing the deposition portion by heating the glass fine particle deposition in a state where a proximal end of the glass rod where the hazy portion is formed is held and the glass fine particle deposition is suspended vertically into the heating furnace.