An insertion device for inserting stud pins in stud pin insertion holes (H01 - H056) provided in a tread portion of a tire, the insertion device comprising: a profile measuring unit comprising a first profile measuring device that measures a profile of the tread portion of the tire; a hole position identification unit that identifies positions in a tire circumferential direction and positions in a tire lateral direction of the stud pin insertion holes (H01 - H056) on the basis of the measured profile; and an insertion unit that inserts the stud pins into the stud pin insertion holes (H01 - H056), the positions of which are identified; wherein the insertion unit comprises a rotation mechanism that rotates the tread portion in the tire circumferential direction; and the first profile measuring device measures an entire profile of the tread portion by measuring the profile of the tread portion in the tire lateral direction while the tread portion is in rotation, characterized in that the measuring unit comprises a second profile measuring device that measures the profile of the tread portion in the tire lateral direction; an insertion position where stud pins are inserted by the insertion unit is set to between a first measuring position where the first profile measuring device measures the tread portion and a second measuring position where the second profile measuring device measures the tread portion; the rotation mechanism rotates the tread portion in a direction from the first measuring position toward the insertion position; the insertion unit inserts stud pins into the stud pin insertion holes (H01 - H056) after the first profile measuring device measures the profile of the tread portion and before the second profile measuring device measures the profile of the tread portion; and the hole position identification unit determines whether or not stud pins have been inserted into the stud pin insertion holes (H01 - H056) by comparing the entire profile of the tread portion measured by the first profile measuring device and the entire profile of the tread portion measured by the second profile measuring device. a profile measuring unit comprising a first profile measuring device that measures a profile of the tread portion of the tire; a hole position identification unit that identifies positions in a tire circumferential direction and positions in a tire lateral direction of the stud pin insertion holes (H01 - H056) on the basis of the measured profile; and an insertion unit that inserts the stud pins into the stud pin insertion holes (H01 - H056), the positions of which are identified; wherein the insertion unit comprises a rotation mechanism that rotates the tread portion in the tire circumferential direction; and the first profile measuring device measures an entire profile of the tread portion by measuring the profile of the tread portion in the tire lateral direction while the tread portion is in rotation, characterized in that the measuring unit comprises a second profile measuring device that measures the profile of the tread portion in the tire lateral direction; an insertion position where stud pins are inserted by the insertion unit is set to between a first measuring position where the first profile measuring device measures the tread portion and a second measuring position where the second profile measuring device measures the tread portion; the rotation mechanism rotates the tread portion in a direction from the first measuring position toward the insertion position; the insertion unit inserts stud pins into the stud pin insertion holes (H01 - H056) after the first profile measuring device measures the profile of the tread portion and before the second profile measuring device measures the profile of the tread portion; and the hole position identification unit determines whether or not stud pins have been inserted into the stud pin insertion holes (H01 - H056) by comparing the entire profile of the tread portion measured by the first profile measuring device and the entire profile of the tread portion measured by the second profile measuring device.