Helmet and helmet manufacturing method

A helmet (1) is provided with a cap body (10) and an impact absorber (20) disposed on the inside of the cap body (10). The shock absorber (20) is provided with: a hemispherical body section (21) having an insertion recess (22) in the outer surface (21a) thereof, and defining an insertion space (10d) that opens toward the insertion opening (10b) of the cap body (10) between the outer surface (21a) of the body section (21) and the inner surface (10c) of the cap body (10); and an insertion member (60) press-fitted into the insertion space (10d). 头盔(1)具备帽体(10)和配置于帽体(10)的内侧的冲击吸收件(20)。冲击吸收件(20)具备：具有半球面形状的主体部(21)，在主体部(21)的外表面(21a)具备插入凹部(22)，在主体部(21)的外表面(21a)与帽体(10)的内表面(10c)之间划定朝向帽体(10)的插入口(10b)开口的插入空间(10d)；和插入构件(60)，压入到插入空间(10d)。