Rocker arm

A rocker arm comprising:

• a roller to be contacted with a cam and having a rotation axis;
• a support shaft having a columnar shape, extending along the rotation axis and coaxially mounted in the roller to rotatably support the roller, the support shaft having a first end portion and a second end portion;
• walls including at least a first wall and a second wall extending perpendicular to the rotation axis and opposite each other with the roller located therebetween, the first wall having a first through hole through which the first end portion of the support shaft is inserted and the second wall having a second through hole through which the second end portion of the support shaft is inserted;
• a bearing arranged between the support shaft and the roller;
• and
• plate portions including at least a first plate portion and a second plate portion arranged opposite each other with the first wall, the second wall and the support shaft located therebetween, the first plate portion being in contact with a first end surface of the first end portion of the support shaft and the second plate portion being in contact with a second end surface of the second end portion of the support shaft.