{HEAD ~ The present invention} provides a cage in which a nitride layer is formed on the surface by using {TAIL ~ an iron and steel material} with 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 
{ HEAD ~ The present invention } provides a cage in which a nitride layer is formed on the surface by using { TAIL ~ an iron and steel material } with 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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