The present invention relates to a protective helmet, particularly for sport activities and the like, comprising an outer protective cap, a first outer protective shell (10) positioned inside and coupled to said outer protective cap, a second inner protective shell (20) positioned inside and coupled to said first outer protective shell (10), and coupling means (30, 40) between said first outer protective shell (10) and said second inner protective shell (20). Said coupling means (30, 40) comprise first damping means (30) and second mechanical retaining means (40) spaced apart from each other and positioned in corresponding seats (11, 142) of said first outer protective shell (10) and second inner protective shell (20).
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