Device for releasably connecting a first element with a second element, which elements are alternately connectable and disconnectable, comprising a male element (1) connectable to one end of said first element, which is inserted into a female element (2), connectable to one end of said second element such that the male element (1) and the female element (2) pass from a disengagement condition to a mutual engagement condition. There is further provided a slider (3) activating/deactivating the engagement condition, which is engaged to the male element (1) so as to slide along the axis of insertion of the male element (1) inside the female element (2). The relative motion between the activation/deactivation slider (3) and the male element (1) is transmitted to first removable locking members, belonging to the male element (1), cooperating with corresponding second locking members belonging to the female element (2), such to pass from a stable locking condition to a stable release condition of the male element (1) with the female element (2), the passage from the locking condition to the release condition and vice versa being performed by a movement of the slider (3) along the axis of insertion.