To reduce friction loss during operation of a chain, and to prevent running-on of the chain, in a chain shoe.

The chain shoes 13, 23 are provided on a chain tensioner arm 10 or a chain guide 20, and have a chain sliding surface 30 on which a chain 7 slides. In the chain shoes 13, 23, at both side edge portions of the chain sliding surface 30 of the shoes, standing wall portions 31 regulating swinging in a width direction of the chain7 are formed. On a chain opposite surface of the standing wall portion 31, a tapered surface 31a tilting to a side separating from the chain 7 toward a tip end is formed. An angle made by the tapered surface 31a to a perpendicular line P raised on the chain sliding surface 30 is set to be 020.