deform to be reduced in diameter so that they can be inserted in the through hole 3 at this time since the disengaging pieces 35 are deformed inwardly by the fingers diameter reduction of the snap pieces 32 is aided through the connecting pieces 33 so that the snap pieces 32 can be inserted easily when the snap pieces 32 are reduced in diameter inwardly they will not interfere with the stopper portions 36 formed on the post 31 when the snap pieces 32 run through the through hole 3 as shown in fig4 b they are restored by their elastic force and enlarge in diameter outwardly and their steps 321 engage with the inner edge of the through hole 3 on the lower surface side of the chassis 2 as the leg pieces 34 abut against the upper surface of the chassis 2 due to their elastic force the entire snap portion 30 is held fitted in the through hole 3 and is prevented from dropping by engagement of the steps 321 and the inner edge of the through hole 3 when the cable tie 1 is attached the impact abutting portions 38 at the lower halves of the stopper portions 36 formed on the post 31 have entered the through hole 3 and the abutting portions 37 at the upper halves are in contact.