Patent ID: 8301072

Claim:
A guiding roller unit, comprising: a holder to be mounted on a specified mount portion; and a guiding roller including a rotary shaft and rotatably supported by the holder, wherein: the holder includes: a base part to be mounted on the mount portion, a pair of bearing parts standing from one end and the other end of the base part to face each other and engaged with opposite ends of the rotary shaft of the guiding roller from outsides to rotatably support the guide roller, and widening preventing parts attached to the pair of bearing parts in such a manner as to extend in directions opposite to facing directions of the respective bearing parts, wherein each of the widening preventing parts has a contact portion that is disposed for directly contacting the mount portion, the base part, the bearing parts and the widening preventing parts being integral to each other, the guide roller being able to be attached and detached to the bearing parts while leading ends of the bearing parts are elastically widened with respect to base ends of the bearing parts connected with the base part when the holder is detached from the mount portion, and the widening of the leading ends of the bearing parts being prohibited by direct contact between the contact portions of the widening preventing parts and the mount portion when the holder is mounted on the mount portion.