Method for producing glass particulate deposit and method for producing glass preform

A production method for a glass particulate deposit which includes a deposition step where a starting rod and a burner for production of glass particles are installed in a reactor, a glass source material is introduced into the burner, the glass source material is subjected to flame thermal decomposition in the flame formed by the burner to thereby form glass particles, and the formed glass particles are deposited on the starting rod to produce a glass particulate deposit, wherein:

• in the deposition step, at least two ejecting ports are provided per one burner for ejecting the glass source material jetting out from the burner, the area of at least one ejecting port of those ejecting ports is 2.25×10−4 or less of the area of the flame forming part of the burner, the glass source material is, in the form of a liquid thereof, supplied to each of the ejecting ports, gas jetting ports are arranged in such a manner that the inner periphery of the gas jetting port is positioned outside by 1.0 mm or less from the outer periphery of the liquid material ejecting port, and a gas is jetted out from the gas jetting port at a flow rate of more than 513 m/s.