Method for manufacturing glass-fine-particle-deposited body and method for manufacturing glass base material

A method for manufacturing a glass-fine-particle-deposited body, the method comprising a depositing step of:

• heating and vaporizing a liquid glass source material placed in a source material container to form a glass source material gas consisting of siloxane,
• introducing the glass source material gas to a burner for producing glass-fine-particles from the source material container through a pipe,
• spouting the glass source material gas from the burner for producing glass-fine-particles, and
• depositing glass fine particles produced by a flame decomposition reaction of the glass source material gas on a starting rod in a reaction container to prepare a glass-fine-particle-deposited body,
• wherein only a single glass source material gas is utilized in preparing the glass-fine-particle-deposited body, and
• wherein at least a part of the pipe from the source material container to the burner for producing glass-fine-particles in the deposition step is temperature-controlled by a heating element so that the burner side of the part of the pipe has a higher temperature than the source material container side of the part of the pipe, and a temperature gradient from the source material container side of the part of the pipe with respect to the burner side of the part of the pipe becomes 5° C./m or more.