The present invention relates to a bicycle helmet which allows a helmet to be used as both a cap and a bicycle helmet by detachably mounting a helmet member on a cap mainly used for outdoor activities to protect the head of a user in the case of an impact. In the configuration of the present invention, the bicycle helmet comprises: a cap (10) mounted on the head of a user in a state in which a visor (11) made of a fabric faces the front side; a cap-shaped helmet member (20) which covers the outside of the cap (10), through which vent holes (25) pass in a state in which a cushion material (22) is joined to the interior of a hard outer plate (21), and which is provided with a fixing strand (26); and a fastening means (30) that detachably fixes the helmet member (20) and the cap (10), wherein a reinforcing plate (23) made of a hard synthetic resin and having holes (24) is buried in the cushion material (22) to reinforce an impact strength, and the cushion material (22) is filled at the location of the holes (24) such that the reinforcing plate (23) and the cushion material (22) are coupled to each other.;COPYRIGHT KIPO 2020
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