PURPOSE: To provide a honeycomb structure molding machine having a small deflection with a low pressure loss.

CONSTITUTION: A honeycomb structure molding machine (base) has a molding discharge channel 2 of a honeycomb structure formed of connected narrow grooves at a downstream end and a plurality of independent green body supply channels 1 connected to the channel 2 and opened at an upstream end, and comprises a latticelike reinforcing ribs 4 provided at positions where do not block the channels 1 on a ligament 9 of an upstream side end face of the machine. Thus, since a deflection of the base can be reduced with low pressure loss without disturbing a flow of green body of the base at the time of extrusion molding, its discharge efficiency is high and an accurately molded form is obtained.