Sealability between a helmet and a shield is improved. The helmet includes a main hat body, a shield, and a seal member. The main hat body is substantially spherical and includes an aperture window that opens forward to provide a field of view to a wearer. The shield is connected to a pair of turning mechanisms protruding from two side faces of the main hat body, and is movable between a closed position at which the shield is located so as to close off the aperture window and an open position at which the shield is located so as to open the aperture window. When the shield is at the closed position, the seal member seals a gap between an upper edge of the shield and an upper edge of the aperture window of the main hat body from a vicinity of one of the turning mechanisms to a vicinity of another of the turning mechanisms. An upper end portion of the shield is inflected toward the main hat body at least at upper edges of left and right end portion vicinities of the seal member.
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