Medium conveying apparatus in which rotation fulcrum of reference member is located inside guide for sliding of unit provided with reference member

A medium conveying apparatus comprising:

• a conveying roller to convey a medium;
• a first unit;
• a second unit facing the first unit;
• an imaging sensor provided in the first unit, to image the medium conveyed by the conveying roller;
• a reference member including a facing surface, and provided in the second unit in such a way that the facing surface is rotatable between a facing position at which the facing surface faces the imaging sensor, and a non-facing position at which the facing surface deviates from the facing position;
• a guide portion to slidably guide the second unit in a direction perpendicular to a medium conveying surface so that the second unit moves in the direction perpendicular to the medium conveying surface;
• and
• a support portion to rotatably support the reference member;
• wherein
• a width of the guide portion is smaller than a length of the second unit in a medium conveying direction;
• and wherein
• the support portion is located inside the guide portion.