A fixture is made up of: a made body 10 composed of a placement portion 12 in which a stripe-shaped member (strap 3) or a line-shaped member is inserted and placed, a through hole 15 through which a bulging portion 2b of an attachment target section 2 can be inserted, and an insertion groove 16 linked to the through hole 15 and extended from the through hole 15 to an opposite side of the placement portion 12 in which the shaft portion 2a of the attachment target section 2 is inserted; engagement members 23 that are rotatably mounted on the main body 10 and that are composed of engagement portions 25 projected inside the insertion groove 16 to form a small hole B larger than the shaft portion 2a and smaller than a bulging portion 2b along with an end portion of the insertion groove 16, and operation portions 28 projected outward from the main body 10: and a biasing member 29 for biasing the engagement members 23 so as to retain the engagement portions 25 of the engagement members 23 in a state of being projected inside the insertion groove 16 of the main body 10. A fixture including: a main body composed of a placement portion in which a stripe-shaped member or a line-shaped member is inserted and placed, a through hole through which a bulging portion of an attachment target section can be inserted, and an insertion groove linked to the through hole and extended from the through hole to an opposite side of the placement portion, in which the shaft portion of the attachment target section is inserted; engagement members that are rotatably mounted on the main body and that are composed of engagement portions projected inside the insertion groove to form a small hole B larger than the shaft portion and smaller than a bulging portion along with an end portion of the insertion groove, and operation portions projected outward from the main body; and a biasing member for biasing the engagement members.