A connecting member includes a housing, a moving element slidably disposed within the housing and having an exposed portion exposed to the outer environment via the housing, an elastic element disposed between the movable element and an inner surface of the housing and biasing the movable element to position the movable element in a first position, at least one stopper disposed on the exposed portion and having an angle with respect to the housing, and a casing disposed on the housing. When the movable element is moved to a second position, the stopper deforms elastically and is received in the casing. When the casing and the housing pass through the connecting holes, the movable element is released and moved to the first position and the stopper escapes from the casing and abuts the soft substrate, whereby the device and the soft substrate are held between the stopper and the housing.