In the construction illustrated as an example of a detachable construction a base attachment piece 432 U shaped in section extends over {HEAD ~ the whole} of {TAIL ~ the circumferential edge} of the extensible elastic surface cover 43, and the attachment piece 432 can simply be attached to or detached from the whole of the circumferential edge of the headrest 3 by hand 
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In the construction illustrated as an example of a detachable construction a base attachment piece 432 U shaped in section extends over { HEAD ~ the whole } of { TAIL ~ the circumferential edge } of the extensible elastic surface cover 43 , and the attachment piece 432 can simply be attached to or detached from the whole of the circumferential edge of the headrest 3 by hand
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