The present invention relates to a fusion splicer having a fastener missing detection, an embodiment of the present invention is , the fasteners are seated and the product receiving portions have been made products; Goods movement imposed for moving parts of the product sits products; And fasteners missing detector for detecting a loss of fasteners to detect a fastener fastened to the product; And fusing unit to perform welding operations with respect to the fastener without missing the fasteners missing inspection of the products finished products; The product moving portion, the fastener missing detector, and a control unit for controlling the melt, the control unit detects that when a fastening component is not missing the product performs a fusing operation of the product, and the fastening of the product components are missing, If the product is to be detected as being configured to discharge. Therefore, fused in a state in which a gap between the parts of the product by carrying out work yungjak fasteners missing detection operation before the fusing operation of the product in the fusion splicer can be prevented from the defect of the product occurs, which can improve the quality of the product is effective. ; 展开▼