A bolting device comprising: an operation part designed to be disposed on a table and comprising a screwdriver bit ; a jig part designed to be disposed on the table to contact an object to be bolted in which a bolt hole (H1) is defined and comprising a through-hole (H2) for guiding a bolt to the bolt-hole (H1); a guide part inserted to the through-hole (H2), having a hollow shape to accommodate the bolt therein, having an inclined inner surface with a shape having an internal diameter that gradually decreases in a downward direction to maintain verticality of the bolt , and having a portion (S) cut in a movement direction of the bolt so that the inner surface is elastically opened when the bolt is moved downward; and an elastic part in contact with an outer circumferential surface of the guide part to elastically support a surrounding portion of a cut portion (S) of the guide part , characterized in that the guide part comprises: an upper body having an internal diameter equal to a head size (D 31 ) of the bolt to contact an end of a head of the bolt ; and a lower body having an internal diameter equal to a screw size (D 32 ) of the bolt to contact a lower end of a screw of the bolt when contracted, wherein the lower body is divided into a plurality of pieces as a portion thereof is cut in the movement direction of the bolt , and the plurality of pieces of the lower body are arranged along a circumference of the upper body and spaced apart from each other. an operation part designed to be disposed on a table and comprising a screwdriver bit ; a jig part designed to be disposed on the table to contact an object to be bolted in which a bolt hole (H1) is defined and comprising a through-hole (H2) for guiding a bolt to the bolt-hole (H1); a guide part inserted to the through-hole (H2), having a hollow shape to accommodate the bolt therein, having an inclined inner surface with a shape having an internal diameter that gradually decreases in a downward direction to maintain verticality of the bolt , and having a portion (S) cut in a movement direction of the bolt so that the inner surface is elastically opened when the bolt is moved downward; and an elastic part in contact with an outer circumferential surface of the guide part to elastically support a surrounding portion of a cut portion (S) of the guide part , characterized in that the guide part comprises: an upper body having an internal diameter equal to a head size (D 31 ) of the bolt to contact an end of a head of the bolt ; and a lower body having an internal diameter equal to a screw size (D 32 ) of the bolt to contact a lower end of a screw of the bolt when contracted, wherein the lower body is divided into a plurality of pieces as a portion thereof is cut in the movement direction of the bolt , and the plurality of pieces of the lower body are arranged along a circumference of the upper body and spaced apart from each other. an upper body having an internal diameter equal to a head size (D 31 ) of the bolt to contact an end of a head of the bolt ; and a lower body having an internal diameter equal to a screw size (D 32 ) of the bolt to contact a lower end of a screw of the bolt when contracted, wherein the lower body is divided into a plurality of pieces as a portion thereof is cut in the movement direction of the bolt , and the plurality of pieces of the lower body are arranged along a circumference of the upper body and spaced apart from each other. <EOS>