A fusible link unit includes a conductive bus-bar having a fusible portion, a resin housing molded integrally with the bus-bar and including a locking projection, and an exposing window portion for exposing the fusible portion, such that the resin cover is capable of being locked to the locking projection so as to cover the fusible portion, where a half-fitting prevention projection is provided at a periphery of the exposing window portion to prevent half-fitting while suppressing an increase in projection costs.