The invention relates to a bidirectional transmitting and receiving device having a transmitting component having an emission area of a first size, that emits light at a first wavelength, and a receiving component having a receiving area of a second size, that receives light at a second wavelength. The first take-out part takes, by suction, a forefront paper sheet out of a plurality of stacked paper sheets and sends out the paper sheet toward a sending-out direction. Since the left eye 200 and right eye 201 look at different objects, the binocular rivalry occurs when looking at the point b with the two eyes.