An image reading device includes a transparent board, a document conveying unit, and a document pick-up member. The transparent board has a document-feed reading region on and a document-fixed reading region. The document conveying unit conveys the document on the document-feed reading region in a document conveying direction. The document pick-up member is provided between the document-feed reading region and the document-fixed reading region to pick up the document conveyed on the document-feed reading region. The document pick-up member has an one end portion that is located on a document-feed reading region side thereof. The one end portion has a distal end positioned at a most upstream end of the one end portion in the document conveying direction. The distal end is located below the upper surface of the transparent board. The one end portion is inclined with respect to a widthwise direction perpendicular to the document conveying direction from the distal end toward the downstream side in the document conveying direction.