To prevent an attachment tool from falling inside a vehicle and improve layout flexibility of components.

The attachment tool 46 includes: a shaft portion 68 having a male screw on the outer peripheral surface thereof; and a head portion 72 that with a second component being attached to a first component, is arranged on the inside of a vehicle, not on the surface of the vehicle. On an end surface of the head portion 72 in the axial direction, a tool insertion recessed portion 90 into which a tool 44 is inserted is formed. In the inner face of the tool insertion recessed portion 90, a first locking portion 92 for locking the tool 44 when the tool 44 inserted into the tool insertion recessed portion 90 is rotated around a shaft line N of the shaft portion 68 is provided. In the inner surface of the tool insertion recessed portion 90 behind an opening 90a of the tool insertion recessed portion 90, a second locking portion 96 for locking the tool 44 when the tool 44 inserted into the tool insertion recessed portion 90 is being pulled out is provided.