PURPOSE: To facilitate the processing of a holding body and the removal of a forming pinlike member by engaging the projecting part of the forming pinlike member and the back face of a flangelike part with the recessed part provided on the holding body front face.

CONSTITUTION: A forming pinlike member 9 is held on a holding body 8 by engaging the projecting part 12 for positioning of the forming pinlike member 9 with the positioning recessed part of the holding body 8 and also seating the back face of a flangelike part 13 on a seat 14. The forming of the positioning recessed part in a specific depth only will do on the holding body 8, the processing amount executed on the holding body 8 is reduced and the processing thereof is facilitated as well. Also, because of the forming pinlike member 9 being able to be separated from the holding body 8 by pulling it forward to the holding body 8, the removal of the forming pinlike member 9 is facilitated even in the state of whatever it may be bent or broken.