A fusible link in which the overlooking of a half-fitted condition of a spacer is positively prevented, and the strength of retaining of the spacer on a housing is increased. Guide walls are formed on an inner surface of the housing (which houses a fuse element), and are disposed respectively in the vicinity of projections for retaining the fuse element-holding spacer. Each of the guide walls forms an insertion space into which a respective one of resilient engagement piece portions of the spacer can be inserted, and the insertion space provides a space which allows elastic displacement of the resilient engagement piece portion when the resilient engagement piece portion is brought into and out of engagement with the projection. Tongue-like portions extend downwardly from a lid which closes an upper open end of the housing, and each of the tongue-like portions is inserted into that portion of the associated insertion space provided between the associated guide wall and the associated resilient engagement piece portion, thereby limiting elastic displacement of the resilient engagement piece portion retainingly engaged with the projection.