PURPOSE: A decoupler structure is provided to effectively absorb impacts and repeated loads applied from the exhaust pipe. CONSTITUTION: A decoupler structure comprises a tube-shaped sleeve(1) for passage of exhaust gas flowing from an engine side; a bellows(4) which covers the sleeve and maintains an airtightness of exhaust gas; an outer blade(3) forming the outermost part of the decoupler, which has both ends fixed by caps(6); an inner retainer having a side fixed between the bellows and the outer blade, an inner end expanded toward the center of the inner retainer, and an end on which the first rim is bent in a circumferential direction; an outer retainer having a side fixed between the bellows and the outer blade, an inner end expanded toward the center of the outer retainer, and an end on which the second rim is bent so as to form a ball guide groove(13); the first buffer unit(20) elastically interposed between the inner retainer and the outer retainer, which buffers the contracting and expanding forces applied from the exhaust pipe; and the second buffer unit(30) interposed between the inner retainer and the outer retainer, which buffers the contracting and expanding forces applied from the exhaust pipe, and a bending force by moving along the ball guide groove.
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