PURPOSE: To obtain a cover tape easily releasable after welding, by constituting the cover tape of a welding material layer and the bonding strength control layer allowed to cover the welding material layer and absorbed by said welding material layer when the welding material layer is melted.

CONSTITUTION: A cover tape 3 is welded to a part receiving tape 2 having part receiving recessed parts 5 in use and consists of a base tape 7, a bonding layer 8, a welding material layer 9 and a bonding strength control layer 10. The welding material layer 9 is applied to the base tape 7 directly or through the bonding layer 8 and has a m.p. lower than that of the part receiving tape 2 and that of the base tape 7. The bonding strength control layer 10 is applied to the welding material layer 9 in order to lower the bonding strength to the part receiving tape 2 and extremely thinly formed so as to be absorbed by the welding material layer 9 when said welding material layer 9 is melted. The welding temp. of the cover tape can be lowered and the thermal deformation of the cover tape 3 and the part receiving tape 2 is hard to generate and the bonding strength of the welding material layer becomes relatively low and the releasing of the cover tape 3 becomes easy.