PURPOSE: To provide a rubber extruding method capable of extruding rubber while setting the temp. of extruded rubber to objective temp.

CONSTITUTION: A screw 3 is rotated in the definite initial reference number of rotations higher than the usual number of rotations to extrude rubber. After a definite time is elapsed, the temp. of the extruded temp. is measured as initial temp. On the basis of the data obtained by preliminarily measuring the relation between the temp. of the extruded rubber 5 and the number of rotations of the screw, the number of rotations of the screw bringing the extruded rubber 5 to objective set temp. from the initial temp. is set. The screw 3 rotated in the initial reference number of rotations is rotated in the selected number of rotations to extrude rubber.