Abstract: There is provided a mechanism for attaching and detaching a portable cordless telephone in a motor vehicle, the mechanism comprising: a holder capable of holding the portable cordless telephone and pivotable from its inmost position in the mechanism to its maximum outwardly projected position; a spring device enabling the holder together with the portable cordless telephone to pivot towards their outwardly projected positions: a lock/unlock device provided for locking/unlocking the holder and the portable cordless telephone on the mechanism. When the holder and the portable cordless telephone are released from their locked conditions by an action of the lock/unlock device, the holder will be pressed by the above spring device, so that the holder together with the portable cordless telephone may pivot outwardly until the holder arrives at its maximum outwardly projected position.