US Patent 7735158 Helmet

A helmet which can ventilate the interior of a head protecting body well by a ventilator mechanism and can decrease the degree of injury or the like of a wearer that may increase by the presence of the ventilator mechanism. At least one of a plurality of attaching mechanisms that attach a cover member or air current deflecting member to the shutter attaching member of the ventilator mechanism includes an engaging projection portion and an engaging hole having a gap. The engaging projection portion is configured to be relatively pressed into the gap and then relatively inserted and held in the engaging hole through the gap.