To obtain a mounting structure capable of being applied to mount an object to be mounted by absorbing a central position variation between a pin and a female mounting member in more directions.A cap pin 26 is formed with a long hole shaped male side fitting portion 36 so as to rotate in an arrow R1 direction with respect to a pin 28 and to relatively move slide in a sliding axis X2 direction. Even if a pin axis X1 of the pin 28 and a central axis X4 of a clip 24 are deviated, the cap pin 26 is rotated and slid; and accordingly, the pin 28 may be inserted and fitted to the male side insertion portion 36.