To promote gasification by the partial combustion of a gasified object.

This shaft type gasification melting furnace comprises a main tuyere formed at the lower part of a furnace side wall, a plurality of auxiliary tuyeres 3 radially formed in the furnace side wall on the upper part of the main tuyere, a gasified object throw-in port 5 formed in the furnace side wall on the upper part of the auxiliary tuyeres 3, and a gas outlet formed at the upper part of the furnace. At least one combustion gas of oxygen and air is blown from the main tuyere and the auxiliary tuyeres into the furnace. An inflammable gas produced by the partial combustion of the gasified object is discharged from the gas outlet. The interval between the auxiliary tuyeres mostly close to the gasified object throw-in port 5 is smaller than the interval between the auxiliary tuyeres when all auxiliary tuyeres 3 are disposed at equal intervals.