A waste gasification melting furnace comprising: a shaft portion configured to dry and pyrolyze wastes charged into the shaft portion, the shaft portion having a waste charging port and a furnace gas exhaust port provided on an upper side of the shaft portion and an opening on a bottom side of the shaft portion for discharging wastes; a melting furnace portion arranged in such a manner that a core of the melting furnace is shifted from a core of the shaft portion, the melting furnace portion having, on an upper side of the melting furnace, an opening through which pyrolyzed wastes and a carbon-based solid fuel are supplied, and having, on a furnace bottom side of the melting furnace, a tuyere through which oxygen-enriched air for combustion is blown into the melting furnace portion, said waste gasification melting furnace being characterized in that said tuyere being configured such that oxygen delivery to be supplied from said tuyere is set to be less than 40% of the total amount of oxygen to be blown into the furnace; and in that the waste gasification melting furnace further comprises a communicated portion configured to connect between the bottom-side opening of the shaft portion and the upper-side opening of the melting furnace portion, wherein the communicated portion includes: a carbonizing grate portion disposed at a position where a load of the wastes charged in the shaft portion is received; a blower configured to blow air used for drying and pyrolysis into the shaft portion from the carbonizing grate portion and configured such that the air contains 60% or more of the total amount of oxygen to be blown into the furnace; and a supply device (31a, 31b) configured to supply pyrolyzed wastes being on the carbonizing grate portion to the upper-side opening of the melting furnace portion, the carbonizing grate portion includes: a supply carbonizing grate disposed on an upper-stage side of the carbonizing grate portion; and a dry distillation carbonizing grate disposed on a lower-stage side of the carbonizing grate portion, the supply device includes: a first supply device for supplying wastes on the supply carbonizing grate toward the dry distillation carbonizing grate; and a second supply device for supplying carbonized wastes on the dry distillation carbonizing grate toward the melting furnace portion, the supply devices being configured such that a supply rate of the second supply device is set to be greater than a supply rate of the first supply device (V2 > V1). a shaft portion configured to dry and pyrolyze wastes charged into the shaft portion, the shaft portion having a waste charging port and a furnace gas exhaust port provided on an upper side of the shaft portion and an opening on a bottom side of the shaft portion for discharging wastes; a melting furnace portion arranged in such a manner that a core of the melting furnace is shifted from a core of the shaft portion, the melting furnace portion having, on an upper side of the melting furnace, an opening through which pyrolyzed wastes and a carbon-based solid fuel are supplied, and having, on a furnace bottom side of the melting furnace, a tuyere through which oxygen-enriched air for combustion is blown into the melting furnace portion, said waste gasification melting furnace being characterized in that said tuyere being configured such that oxygen delivery to be supplied from said tuyere is set to be less than 40% of the total amount of oxygen to be blown into the furnace; and in that the waste gasification melting furnace further comprises a communicated portion configured to connect between the bottom-side opening of the shaft portion and the upper-side opening of the melting furnace portion, wherein the communicated portion includes: a carbonizing grate portion disposed at a position where a load of the wastes charged in the shaft portion is received; a blower configured to blow air used for drying and pyrolysis into the shaft portion from the carbonizing grate portion and configured such that the air contains 60% or more of the total amount of oxygen to be blown into the furnace; and a supply device (31a, 31b) configured to supply pyrolyzed wastes being on the carbonizing grate portion to the upper-side opening of the melting furnace portion, the carbonizing grate portion includes: a supply carbonizing grate disposed on an upper-stage side of the carbonizing grate portion; and a dry distillation carbonizing grate disposed on a lower-stage side of the carbonizing grate portion, the supply device includes: a first supply device for supplying wastes on the supply carbonizing grate toward the dry distillation carbonizing grate; and a second supply device for supplying carbonized wastes on the dry distillation carbonizing grate toward the melting furnace portion, the supply devices being configured such that a supply rate of the second supply device is set to be greater than a supply rate of the first supply device (V2 > V1).