Method for producing optical fiber

A method for producing an optical fiber that comprises a glass portion and a resin coating portion, the glass portion including a core and a cladding surrounding the core,

• wherein a core part of an optical fiber preform has an average concentration of an alkali metal of 5 atomic ppm or more and an average concentration of a halogen element of 1000 atomic ppm or more,
• the average concentration of an additive element other than the alkali metal or the halogen element in the core part is equal to or lower than the average concentration of the halogen element in the core part,
• the optical fiber preform has a diameter of 70 to 170 mm,
• the drawing speed of the optical fiber when the optical fiber is drawn is 600 m/min or more,
• a force applied to a glass portion is in the range of 0.29 N to 1.47 N, and
• the glass portion being under residual stress which is a compressive stress of 130 MPa or less.