To provide a carbide roughing end mill for high speed cutting made of carbide alloy, which increases a volume for discharging chips, preventing damages relating to bites of the chips, and showing a stable life.

In this carbide roughing end mill for high speed cutting made of carbide alloy used for high speed cutting, a rake angle of a roughing cutting blade is made to 0-15 degrees. Core thickness is made to 50%-60% of a blade diameter, and a groove ratio F is made to 0.65-0.8 seen from an axially perpendicular cross section. A back face from a groove bottom of the blade groove to a heel of the blade groove is set to 90-130 degrees relative to a line connecting the roughing cutting blade and a rotary center.