A dust suction drill comprising: a drill tip with cutting edge portions formed on a distal end of the drill tip; a shaft joined to the drill tip and configured to rotate about an axis line; and a dust suction passage for sucking dust that is generated when the cutting edge portions rotate, the dust suction passage being formed inside the shaft, wherein the cutting edge portions and the drill tip are made of a metal and integrally formed together, the cutting edge portions are provided on a distal end surface of the drill tip and spaced apart from each other in a circumferential direction, cutting edges, each of which is formed by a joint ridge between a rake face and a relief face of a corresponding one of the cutting edge portions, are arranged radially, and at a center of the drill tip, form a chisel point, which is a pointed end, and a dust suction hole, which communicates with the dust suction passage, is formed in the rake face or the relief face closely to the chisel point, or formed over the joint ridge between the rake face and the relief face closely to the chisel point, wherein: the dust suction passage is formed extending substantially parallel to the axis line, the dust suction drill being characterized in that an auxiliary passage, which communicates with the dust suction passage and in which a removal member for pushing dust out of the dust suction passage is insertable, is formed in the shaft, and in that an auxiliary passage closing cover is attached to the shaft, the auxiliary passage closing cover being configured to rotate about the axis line and switch a state of the auxiliary passage between_a closed state and an open state by rotating about the axis line. a drill tip with cutting edge portions formed on a distal end of the drill tip; a shaft joined to the drill tip and configured to rotate about an axis line; and a dust suction passage for sucking dust that is generated when the cutting edge portions rotate, the dust suction passage being formed inside the shaft, the cutting edge portions and the drill tip are made of a metal and integrally formed together, the cutting edge portions are provided on a distal end surface of the drill tip and spaced apart from each other in a circumferential direction, cutting edges, each of which is formed by a joint ridge between a rake face and a relief face of a corresponding one of the cutting edge portions, are arranged radially, and at a center of the drill tip, form a chisel point, which is a pointed end, and a dust suction hole, which communicates with the dust suction passage, is formed in the rake face or the relief face closely to the chisel point, or formed over the joint ridge between the rake face and the relief face closely to the chisel point, wherein: the dust suction passage is formed extending substantially parallel to the axis line, the dust suction drill being characterized in that an auxiliary passage, which communicates with the dust suction passage and in which a removal member for pushing dust out of the dust suction passage is insertable, is formed in the shaft, and in that an auxiliary passage closing cover is attached to the shaft, the auxiliary passage closing cover being configured to rotate about the axis line and switch a state of the auxiliary passage between_a closed state and an open state by rotating about the axis line. the dust suction passage is formed extending substantially parallel to the axis line, the dust suction drill being characterized in that an auxiliary passage, which communicates with the dust suction passage and in which a removal member for pushing dust out of the dust suction passage is insertable, is formed in the shaft, and in that an auxiliary passage closing cover is attached to the shaft, the auxiliary passage closing cover being configured to rotate about the axis line and switch a state of the auxiliary passage between_a closed state and an open state by rotating about the axis line.