HARD HAT TO PROTECT ONE'S BACK OF THE HEAD

摘要

A safety helmet is provided to protect the entire portion of a user's head including a side portion and a rear portion of the head from external shock safely. The safety helmet for protecting whole head includes a body(10) and an extension protection portion(20). An upper end of the body(10) has a shape of a hemisphere and a lower end of the body(10) is open. The extension protection portion(20) is fixed on a fixing end(10a,20a) on lower edges of both lateral and rear sides of the body(10) to protect a user's ear and rear head. Plural ventilation holes(22) are formed along the circumference of a side portion and a rear portion of the extension protection portion(20), and plural sound transmission holes(21) are formed on the side portion.