Medium processing device and medium processing method

PROBLEM TO BE SOLVED: To provide a money processor 10 and a money processing method capable of more accurately detecting a clip 40 from input objects inputted by a user and facilitating the removal of the detected clip 40.SOLUTION: A money processor 10 comprises: a conveyance path 16 for conveying an inputted input object; a light emission section 22 that emits illumination light La toward the conveyed input object; a photographing section 23 that receives reflection light Lb which is the illumination light La reflected at the input object, and photographs the input object; a storage section 18 that stores a photographed image of the input object photographed by the photographing section 23; a control section 20 that determines whether or not the input object is a processable medium on the basis of an outline of the input object extracted from the photographed image, and when the input object is not a processable coin 30, identifies the input object as a foreign object, and outputs a foreign object image 55 indicating the shape of a clip 40; and a second operation/display section 25 that displays the foreign object image 55.