Patent attributes
A helmet in which a subsidiary cap portion hardly pivots forward about an axial support means thereof as a fulcrum to undesirably move upward accidentally when a comparatively large impact acts on the helmet. A subsidiary cap portion locking mechanism which locks the subsidiary cap portion at a lower position includes a lock pin on a main cap portion and a locking recess for a lock lever on the subsidiary cap portion. While the subsidiary cap portion is in a backward state, an angle that a third straight line, which extends in a direction along which the lock pin starts to disengage from the locking recess, forms with a second straight line obtained by extending a first straight line, which extends from the axial support means of the subsidiary cap portion to the lock pin, falls within a range between an angle which is upward from the second straight line by 65° (preferably 40° and more preferably 15°) and an angle which is downward from the second straight line by 85° (preferably 60° and more preferably 35°).
