A cannula for minimally invasive surgery, comprising two coaxial tubes - an outer short one (2) and an inner long one (3), of which the inner long tube (3) is slidably movable relative to the outer short tube (2), and a head (4) which in the folded position has a cone shape with an axial inlet hole (5) in the axis of the upper base, while in the unfolded position, with the outer short tube (2) slid off in the distal direction, the head (4) has the shape of a cup extending outwardly. The outer edge of the cup has a diameter about three times the inner diameter of the cannula (1). The outer short tube (2) is equipped with at least one rigid tie rod (8) the free end of which extends along the inner wall of the inner long tube (3) beyond its distal end.
