A fastening pin to be driven into a rigid member, the fastening pin comprising: an enlarged head part; and a shaft part, wherein the shaft part includes: a large diameter section formed below the enlarged head part; a middle shaft section formed below the large diameter section; and a small diameter section extending from the middle shaft section to a leading end of the fastening pin, wherein the large diameter section includes a round portion formed below the enlarged head part and a taper portion formed between the round portion and the middle shaft section, and a diameter of the large diameter section at a side of the enlarged head part is larger than a diameter of the large diameter section at a side of the middle shaft section, wherein the middle shaft section has a uniform diameter from a side of the large diameter section to a side of the small diameter section, and wherein a side of a leading end of the small diameter section has a bullet shape, characterized in that the small diameter section includes: a lower middle shaft portion having a uniform diameter which is smaller than a diameter of the middle shaft section; a lower taper portion provided between the lower middle shaft portion and the middle shaft section; and a leading end portion provided below the lower middle shaft portion and formed in the bullet shape, and wherein a taper angle (θ1) of the taper portion is within a range from 2 to 5 degree. an enlarged head part; and a shaft part, wherein the shaft part includes: a large diameter section formed below the enlarged head part; a middle shaft section formed below the large diameter section; and a small diameter section extending from the middle shaft section to a leading end of the fastening pin, a large diameter section formed below the enlarged head part; a middle shaft section formed below the large diameter section; and a small diameter section extending from the middle shaft section to a leading end of the fastening pin, wherein the large diameter section includes a round portion formed below the enlarged head part and a taper portion formed between the round portion and the middle shaft section, and a diameter of the large diameter section at a side of the enlarged head part is larger than a diameter of the large diameter section at a side of the middle shaft section, wherein the middle shaft section has a uniform diameter from a side of the large diameter section to a side of the small diameter section, and wherein a side of a leading end of the small diameter section has a bullet shape, characterized in that the small diameter section includes: a lower middle shaft portion having a uniform diameter which is smaller than a diameter of the middle shaft section; a lower taper portion provided between the lower middle shaft portion and the middle shaft section; and a leading end portion provided below the lower middle shaft portion and formed in the bullet shape, and a lower middle shaft portion having a uniform diameter which is smaller than a diameter of the middle shaft section; a lower taper portion provided between the lower middle shaft portion and the middle shaft section; and a leading end portion provided below the lower middle shaft portion and formed in the bullet shape, and wherein a taper angle (θ1) of the taper portion is within a range from 2 to 5 degree.