Image forming apparatus

An image forming apparatus, comprising:

• a belt configured to convey a sheet;
• a plurality of rollers over which the belt is stretched, the plurality of rollers including a drive roller to which a drive force is to be applied;
• a support portion configured to support at least one of the plurality of rollers in a manner that allows the at least one of the plurality of rollers to rotate;
• an ejection portion configured to eject ink onto the sheet conveyed by the belt;
• a movable member placed in a movable manner on an inner circumferential surface side of the belt in order to adjust a distance between the ejection portion and an outer circumferential surface of the belt at a position opposed to the ejection portion;
• a cam configured to displace a position of the movable member in relation to the plurality of rollers;
• and
• a control portion configured to rotate, in order to adjust the distance, the cam by an amount depending on a basis weight of the sheet.