Helmet comprising a shell and a protective shield, wherein the protective shield is arranged in a frontal area of the shell, and wherein a rear or nape area of the shell is opposite to the frontal area, the protective shield is connected in a rotatable way around a pivot axis to the shell in respective lateral regions, or right-hand and left-hand regions, of the shell by means of an opening-closing device, wherein the protective shield is configured to take on, with respect to said shell, a closed position of said protective shield, an open position of said protective shield, and an intermediate position between said closed position of said protective shield and said open position of said protective shield, wherein said opening-closing device of said protective shield is configured to allow a passage of said protective shield with respect to said shell from said closed position of said protective shield to said intermediate position and to said open position of said protective shield, or from said open position of said protective shield to said intermediate position and to said closed position of said protective shield, and wherein, by means of said opening-closing device, a passage from said closed position to said intermediate position corresponds to a movement away of a corresponding lateral region of the protective shield from the shell in the lateral direction, and a passage from said intermediate position to said closed position corresponds to a movement of the lateral region of the protective shield towards the shell in the lateral direction, wherein said opening-closing device comprises a first element associated with said shell, a second element associated with said protective shield, and a third element or connecting element, associated with said second element and said first element, or configured to associate said second element with said first element, wherein said second element is movable with respect to said first element at least between a first position and a second position, wherein said first position of the second element is closer to said first element along the lateral direction than said second position of the second element and wherein said first position of the second element corresponds to said closed position of said protective shield, and said second position of the second element corresponds to said intermediate position of said protective shield between said closed position of said protective shield and said open position of said protective shield, characterised in that said opening-closing device comprises an energy storage element configured to store energy, wherein an energy storage condition corresponds to a condition wherein said second element of the opening-closing device is kept in said first position. wherein said opening-closing device of said protective shield is configured to allow a passage of said protective shield with respect to said shell from said closed position of said protective shield to said intermediate position and to said open position of said protective shield, or from said open position of said protective shield to said intermediate position and to said closed position of said protective shield, and wherein, by means of said opening-closing device, a passage from said closed position to said intermediate position corresponds to a movement away of a corresponding lateral region of the protective shield from the shell in the lateral direction, and a passage from said intermediate position to said closed position corresponds to a movement of the lateral region of the protective shield towards the shell in the lateral direction, wherein said opening-closing device comprises a first element associated with said shell, a second element associated with said protective shield, and a third element or connecting element, associated with said second element and said first element, or configured to associate said second element with said first element, wherein said second element is movable with respect to said first element at least between a first position and a second position, wherein said first position of the second element is closer to said first element along the lateral direction than said second position of the second element and wherein said first position of the second element corresponds to said closed position of said protective shield, and said second position of the second element corresponds to said intermediate position of said protective shield between said closed position of said protective shield and said open position of said protective shield, characterised in that said opening-closing device comprises an energy storage element configured to store energy, wherein an energy storage condition corresponds to a condition wherein said second element of the opening-closing device is kept in said first position.