Drill

A drill having a shank (10) formed with helical or straight flutes (3) for discharging chips therethrough and a pair of cutting edges (2) formed at one end of the shank and extending continuously from the center of rotation of the drill to the periphery thereof. Each of the flutes is defined by a wall (32,62,64,66,72,74,76) which is positioned rearward with respect to the direction of rotation of the drill and against which a flat plate portion of the chip (4) formed by the portion of the cutting edge on the peripheral side is to be pressed, and by a wall (31,61,63,65,73,75,77) positioned forward with respect to the direction for a side edge portion of the chip to come into contact with. The forward wall is inclined with respect to the rearward wall so as to prevent the chip from curling in its entirety. The drill is given improved rigidity and adapted to discharge chips as broken into fragments of suitable length.