A drill comprising: a drill main body configured to be rotated around a shaft center; a plurality of discharge grooves provided in a helical shape in an outer peripheral surface, from a leading end portion toward a base end portion of the drill main body ; a cutting edge formed on a ridge section between an inner face of the discharge groove that is oriented toward a rotation direction side of the drill main body , and a flank of the drill main body at the leading end portion; a thinning edge provided at the leading end portion of the drill main body and extending from an inner end of the cutting edge toward a chisel portion that is a leading end section of the drill main body ; and a gash portion , a ridge with respect to the flank extending in a circular arc shape from an inner end of the thinning edge , connecting to the discharge groove further to an inner peripheral side than the outer peripheral surface of the drill main body , wherein the gash portion includes a circular arc groove that have a circular arc shaped in a cross section, and that is provided in a section that connects a gash face of the gash portion and a thinning face which is a rake face and which connects the thinning edge and the discharge groove , the drill is a double-edged drill that is provided with two sets of the cutting edges , characterised in that when the drill main body is seen from the leading end, a gash furrow (E) that indicates a distance, in a first direction, between a tangential line (B) of one of the gash portions and a tangential line (C) of an other of the gash portions , which follow a second direction orthogonal to the first direction along with a tangential line (A) at the inner end of the thinning edge , is at least 0.02D and no more than 0.04D, where D is an outer diameter of the drill . a drill main body configured to be rotated around a shaft center; a plurality of discharge grooves provided in a helical shape in an outer peripheral surface, from a leading end portion toward a base end portion of the drill main body ; a cutting edge formed on a ridge section between an inner face of the discharge groove that is oriented toward a rotation direction side of the drill main body , and a flank of the drill main body at the leading end portion; a thinning edge provided at the leading end portion of the drill main body and extending from an inner end of the cutting edge toward a chisel portion that is a leading end section of the drill main body ; and a gash portion , a ridge with respect to the flank extending in a circular arc shape from an inner end of the thinning edge , connecting to the discharge groove further to an inner peripheral side than the outer peripheral surface of the drill main body , wherein the gash portion includes a circular arc groove that have a circular arc shaped in a cross section, and that is provided in a section that connects a gash face of the gash portion and a thinning face which is a rake face and which connects the thinning edge and the discharge groove , the drill is a double-edged drill that is provided with two sets of the cutting edges , characterised in that when the drill main body is seen from the leading end, a gash furrow (E) that indicates a distance, in a first direction, between a tangential line (B) of one of the gash portions and a tangential line (C) of an other of the gash portions , which follow a second direction orthogonal to the first direction along with a tangential line (A) at the inner end of the thinning edge , is at least 0.02D and no more than 0.04D, where D is an outer diameter of the drill . <EOS>