To properly restrain side slippage to a fixing end side of a belt on a control roller, in a bill conveyer for an ATM constituted to control meandering of the belt by the control roller with its one end fixed as a fixed end and with the other end serving as a movable end.

A regulation ring 51 rotatable coaxially and relatively with respect to a control roller 9 is provided in a fixed end 9a of the roller 9 to regulate deviation, to a fixed end 9a side, of a belt 11 while rotation-driving the regulation ring 51 by contact with the belt 11 deviated to the fixed end 9a side. An E-ring 55 is arranged in a control roller 9 side of the regulation ring 51 in this case to form and secure a space, between the ring 51 and the control roller 9, for avoiding contact of the both rollers 51, 9.