A method of producing a disposable wearing article which includes a front Stretchable multilayer member defining an abdominal-side front zone, a rear stretchable multilayer member defining a dorsal-side rear zone, an absorbent body disposed to bridge between said front stretchable multilayer member and said rear stretchable multilayer member, wherein said front stretchable multilayer member and said rear stretchable multilayer member are joined together to form a waist opening, said method comprising the steps of: continuously feeding said front stretchable multilayer member and said rear stretchable multilayer member with a given distance therebetween; preparing said absorbent body: forming at least one cutting line in said front stretchable multilayer member; attaching one of a hook element and a loop element of a mechanical fastener to an inner surface of said front stretchable multilayer member at both sides of said cutting line; feeding the absorbent body having one of the corresponding hook element or loop element of the mechanical fastener attached onto an outer surface of the front end (la) of the absorbent body; bonding a rear end portion of said absorbent body to said rear stretchable multilayer member and detachably engaging a front end portion of said absorbent body with said one of the hook element and the loop element attached to said front stretchable multilayer member so that the front end portion of said absorbent body is in opposed facing relationship to said cutting line; and superimposing said front stretchable multilayer member and said rear stretchable multilayer member in such a manner that they be located on opposite sides of said absorbent body, and joining respective portions of said superimposed stretchable multilayer members (17A, 17B) to be formed as lateral edges of said disposable wearing article, characterized in that a portion of said front stretchable multilayer member corresponding to the loop element is subjected to a treatment for reducing the stretchability of the portion so as to facilitate the attachment of the mechanical fastener and prevent the occurrence of wrinkles in a mechanical fastener area of a finished disposable wearing article. continuously feeding said front stretchable multilayer member and said rear stretchable multilayer member with a given distance therebetween; preparing said absorbent body: forming at least one cutting line in said front stretchable multilayer member; attaching one of a hook element and a loop element of a mechanical fastener to an inner surface of said front stretchable multilayer member at both sides of said cutting line; feeding the absorbent body having one of the corresponding hook element or loop element of the mechanical fastener attached onto an outer surface of the front end (la) of the absorbent body; bonding a rear end portion of said absorbent body to said rear stretchable multilayer member and detachably engaging a front end portion of said absorbent body with said one of the hook element and the loop element attached to said front stretchable multilayer member so that the front end portion of said absorbent body is in opposed facing relationship to said cutting line; and superimposing said front stretchable multilayer member and said rear stretchable multilayer member in such a manner that they be located on opposite sides of said absorbent body, and joining respective portions of said superimposed stretchable multilayer members (17A, 17B) to be formed as lateral edges of said disposable wearing article, characterized in that a portion of said front stretchable multilayer member corresponding to the loop element is subjected to a treatment for reducing the stretchability of the portion so as to facilitate the attachment of the mechanical fastener and prevent the occurrence of wrinkles in a mechanical fastener area of a finished disposable wearing article. forming at least one cutting line in said front stretchable multilayer member; attaching one of a hook element and a loop element of a mechanical fastener to an inner surface of said front stretchable multilayer member at both sides of said cutting line; feeding the absorbent body having one of the corresponding hook element or loop element of the mechanical fastener attached onto an outer surface of the front end (la) of the absorbent body; bonding a rear end portion of said absorbent body to said rear stretchable multilayer member and detachably engaging a front end portion of said absorbent body with said one of the hook element and the loop element attached to said front stretchable multilayer member so that the front end portion of said absorbent body is in opposed facing relationship to said cutting line; and superimposing said front stretchable multilayer member and said rear stretchable multilayer member in such a manner that they be located on opposite sides of said absorbent body, and joining respective portions of said superimposed stretchable multilayer members (17A, 17B) to be formed as lateral edges of said disposable wearing article, characterized in that a portion of said front stretchable multilayer member corresponding to the loop element is subjected to a treatment for reducing the stretchability of the portion so as to facilitate the attachment of the mechanical fastener and prevent the occurrence of wrinkles in a mechanical fastener area of a finished disposable wearing article.