A drill comprising: a drill main body configured to be rotated about an axis; a chip discharge flute, which has an opening in a tip flank face of the drill main body and extends toward a rear end side of the drill main body, formed on an outer circumference of a front end portion of the drill main body; and a cutting edge formed on an intersection ridgeline between a wall surface of the chip discharge flute facing a drill rotation direction and the tip flank face, wherein a thinning rake face is formed in a front end inner peripheral portion of the wall surface facing the drill rotation direction of the chip discharge flute by a thinning part being formed in a front end inner peripheral portion of the chip discharge flute, and a thinning edge, which is an inner peripheral portion of the cutting edge, is formed on an intersection ridgeline between the thinning rake face and the tip flank face, a first thinning wall surface, which is connected to the thinning rake face and faces an outer circumference side of the drill main body, and a second thinning wall surface, which is connected to the first thinning wall surface and extends toward a heel side, are formed on a wall surface facing an opposite side of the drill rotation direction of the chip discharge flute, an intersection ridgeline between the first thinning wall surface and the tip flank face is a first thinning ridgeline, and an intersection ridgeline between the second thinning wall surface and the tip flank face is a second thinning ridgeline, and the second thinning ridgeline is bent to the opposite side of the drill rotation direction with respect to an extension line of the first thinning ridgeline toward the outer circumference side of the drill main body, characterized in that, as viewed from a side of the front end in a direction of the axis, an intersection angle between the thinning edge and the first thinning ridgeline is larger than 95°, and the thinning edge and the first thinning ridgeline are connected to each other via a concave curve line, the first thinning wall surface and the second thinning wall surface are connected to each other via a concave surface, and a curvature radius of the concave curve line is smaller than a curvature radius of the concave surface. a drill main body configured to be rotated about an axis; a chip discharge flute, which has an opening in a tip flank face of the drill main body and extends toward a rear end side of the drill main body, formed on an outer circumference of a front end portion of the drill main body; and a cutting edge formed on an intersection ridgeline between a wall surface of the chip discharge flute facing a drill rotation direction and the tip flank face, wherein a thinning rake face is formed in a front end inner peripheral portion of the wall surface facing the drill rotation direction of the chip discharge flute by a thinning part being formed in a front end inner peripheral portion of the chip discharge flute, and a thinning edge, which is an inner peripheral portion of the cutting edge, is formed on an intersection ridgeline between the thinning rake face and the tip flank face, a first thinning wall surface, which is connected to the thinning rake face and faces an outer circumference side of the drill main body, and a second thinning wall surface, which is connected to the first thinning wall surface and extends toward a heel side, are formed on a wall surface facing an opposite side of the drill rotation direction of the chip discharge flute, an intersection ridgeline between the first thinning wall surface and the tip flank face is a first thinning ridgeline, and an intersection ridgeline between the second thinning wall surface and the tip flank face is a second thinning ridgeline, and the second thinning ridgeline is bent to the opposite side of the drill rotation direction with respect to an extension line of the first thinning ridgeline toward the outer circumference side of the drill main body, characterized in that, as viewed from a side of the front end in a direction of the axis, an intersection angle between the thinning edge and the first thinning ridgeline is larger than 95°, and the thinning edge and the first thinning ridgeline are connected to each other via a concave curve line, the first thinning wall surface and the second thinning wall surface are connected to each other via a concave surface, and a curvature radius of the concave curve line is smaller than a curvature radius of the concave surface.