A jointing member has a grommet and a pin. The grommet includes a flange portion and a leg portion capable of being opened, in which an insertion hole is formed from the center of the flange portion to the inner portion of the leg portion, and an engagement portion is formed at the inner surface of the leg portion. The pin includes a head portion and a shaft portion to be inserted into the insertion hole, in which an engagement surface and a lock surface each engaging with the engagement portions are formed at the shaft portion. In the jointed and fixed state of panel members, when an unexpected external force is applied to the tip end of the shaft portion of the pin, the engagement portion engages with the lock surface of the pin.