To prevent severance of an electric wire drawn out of a holder in an abrasion detection probe due to vibration or the like.

The abrasion detection probe 1 is provided with the holder 10 attached to a brake pad capable of braking a rotor by contacting the rotor, and a detection electric wire 20 drawn out from an interior of the holder 10. As abrasion of the brake pad progresses, the detection electric wire 20 in the interior of the holder 10 is severed, and by this, it is detected that an application limit of the brake pad has been reached. In such a case, an electric wire fixing part 30 is provided fixing the detection electric wire 20 by having flexibility more softer than the holder 10, being connected to the holder 10, and extending in a drawing direction of the detection electric wire 20.