To use one kind of decorative cover for both a linear protection duct and a corrugated protection duct in common, and to provide a satisfactory appearance in a penetration-through part.

This decorative cover for the wall penetration-through part includes a receiver 13 capable of storing a refrigerant pipe in an inside, and capable of inserting both the liner protection duct 31 and the corrugated protection duct to be protected, a decorative part 12 for covering a clearance between an outer face of each protection duct and a through-hole 53 of a wall material 51, and a fixing hole for fixation onto the wall material 51. The receiver 13 is provided with a projection part 16 projected inwards, coming into an inside of an annular recess of the corrugated protection duct, and for closing the clearance between the outer face of the linear protection duct 31 and the receiver 13, along the outer face.