To provide a fixture or fixing parts such as an assist grip for vehicle on an installed member such as a body.

This fixture for fixing the parts such as the assist grip 3 for vehicle on the installed member such as the body 6 comprises a plastic clip 1 and a plastic pin 2. The clip 1 comprises a shaft part 9 allowed to be inserted into the mounting hole of the installed member and formed in a hollow cylindrical shape and a flange 10. The pin 2 comprises a shank part 27 inserted into the hollow portion of the clip shaft part 9 and a flange 29. An elastic leg part 17 extending from a root position apart from the clip flange longitudinally in the direction of the clip flange is formed on the clip shaft part 9, a locking shoulder 21 engaged with an installation hole edge part of the body 6 is formed at the tip of the elastic leg part, and the locking shoulder 21 is projected from the outer surface of the clip shaft part to such a length that can be locked to the installation member by pushing out the tip portion of the elastic leg part from the hollow portion of the clip shaft part to the radial outside by the pin shank part 27 inserted into the clip shaft part 9.