The present invention provides a cage in which a nitride layer is formed on the surface by using {HEAD ~ an iron and steel material} with {TAIL ~ a carbon content} of 0.25% by weight or less, fabricating it into a predetermined shape and conducting nitriding, which is more excellent in slidability and wear resistance than conventional one 
with
The present invention provides a cage in which a nitride layer is formed on the surface by using { HEAD ~ an iron and steel material } with { TAIL ~ a carbon content } of 0.25 % by weight or less , fabricating it into a predetermined shape and conducting nitriding , which is more excellent in slidability and wear resistance than conventional one
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