The present invention relates to a carabiner, particularly a wire carabiner, for mountaineering and climbing comprising a ring having a side, which is interrupted by an opening defined by a first and a second end, wherein said opening is closed by a spring closing member that may take an open position and a closed position, wherein the first end of the ring comprises a bulb-shaped coupling portion, with the part projecting in the transversal direction with respect to the plane of the carabiner, and wherein the closing member is of the so-called “wire lever” type and comprises a lever member consisting of a metal wire, wherein said lever member is associated with a coupling member with the coupling portion of the ring, said coupling member comprising a seat, having such shape and dimensions as to couple with said coupling portion, and a constraint portion to the lever member.