Disclosed is a side shield which can be easily assembled with and separated from the eyewear temple, identically widen together with the eyewear temple, and prevent the external impact from being transferred to and reaching the eyewear. The side shield includes a shield body surrounding a hinge, through which an eyewear temple is connected with an eyewear frame of an eyewear, and covering a side space of the eyewear frame, to prevent foreign substances from entering the eyes, the shield body including blocking wings formed at an upper part and a lower part of the shield body, and a coupling means for maintaining a coupling state between the shield body and the eyewear temple, the coupling means being provided at the shield body and including a coupler assembled with the eyewear temple and a fastener for fastening the coupler. Therefore, the side shield is easily detachable and further includes the elastic means, to improve the wearing comfort.