Image recording apparatus

An image recording apparatus comprising:

• a belt passed around a drive pulley and a driven pulley;
• a support member configured to support a recording head and fixed to the belt;
• a holder member, having a claw part and an operating part, configured to hold the driven pulley;
• a frame having a first opening through which the claw part is capable of penetrating from a front side to a back side of the frame and a second opening through which the operating part is capable of penetrating from the front side to the back side of the frame, and to which the holder member is attached such as to be movable relative to the drive pulley;
• and
• a biasing member that applies a force to the operating part on the back side of the frame in a direction away from the drive pulley,
• wherein the first opening having an enlarged opening portion allowing the claw part to pass through without engaging with the frame on one side closer to the drive pulley, and
• wherein, in a state where movement of the holder member toward the drive pulley is restricted by the frame, at least a portion of the claw part is engaged with the frame and is positioned within a part of the first opening excluding the enlarged opening portion.