A nail tip guide tool of a nailing machine, which is used by being mounted to a tip portion of a nose portion forming a passage for driving out various nails from an air nailing machine, the nail tip guide tool comprising: a guide piece molded such that when a plurality of guide pieces are gathered together at a central portion of an inclined bottom surface of a funnel-shaped container member, a mortar-shaped recess portion is formed at a central portion of an upper surface of an aggregate of the plurality of guide pieces, a lid member of the funnel-shaped container member and the funnel-shaped container member are joined together by screw threads provided at the lid member and the funnel-shaped container member, the nailing machine and the nail tip guide tool are joined together by a screw thread provided at the lid member of the funnel-shaped container member to correspond to a screw thread provided at an outer peripheral portion of a tip of the nose portion of the nailing machine, a tip of a nail driven in a tilted posture from the nose portion is guidable to a central portion of the mortar-shaped recess portion, and the nail is capable of continuing to be pushed in at a position of the central portion of the mortar-shaped recess portion, so that the plurality of guide pieces are pushed and expanded to right and left and grip and surround a nail shaft portion of the driven nail to straighten the posture of the nail, wherein the nail tip guide tool is characterized by: a protrusion portion provided on an outer peripheral portion of an upper surface of the guide piece and fitted into a recessed rail radially provided on a lower surface of a torus-shaped press board, a coil spring having extension elasticity is fitted into both a circular groove for receiving the coil spring, which is provided on an upper surface of the torus-shaped press board, and a circular groove for receiving the coil spring, which is provided on a lower surface of the lid member of the funnel-shaped container member. a guide piece molded such that when a plurality of guide pieces are gathered together at a central portion of an inclined bottom surface of a funnel-shaped container member, a mortar-shaped recess portion is formed at a central portion of an upper surface of an aggregate of the plurality of guide pieces, a lid member of the funnel-shaped container member and the funnel-shaped container member are joined together by screw threads provided at the lid member and the funnel-shaped container member, the nailing machine and the nail tip guide tool are joined together by a screw thread provided at the lid member of the funnel-shaped container member to correspond to a screw thread provided at an outer peripheral portion of a tip of the nose portion of the nailing machine, a tip of a nail driven in a tilted posture from the nose portion is guidable to a central portion of the mortar-shaped recess portion, and the nail is capable of continuing to be pushed in at a position of the central portion of the mortar-shaped recess portion, so that the plurality of guide pieces are pushed and expanded to right and left and grip and surround a nail shaft portion of the driven nail to straighten the posture of the nail, wherein the nail tip guide tool is characterized by: a protrusion portion provided on an outer peripheral portion of an upper surface of the guide piece and fitted into a recessed rail radially provided on a lower surface of a torus-shaped press board, a coil spring having extension elasticity is fitted into both a circular groove for receiving the coil spring, which is provided on an upper surface of the torus-shaped press board, and a circular groove for receiving the coil spring, which is provided on a lower surface of the lid member of the funnel-shaped container member. a protrusion portion provided on an outer peripheral portion of an upper surface of the guide piece and fitted into a recessed rail radially provided on a lower surface of a torus-shaped press board, a coil spring having extension elasticity is fitted into both a circular groove for receiving the coil spring, which is provided on an upper surface of the torus-shaped press board, and a circular groove for receiving the coil spring, which is provided on a lower surface of the lid member of the funnel-shaped container member.