A display change device is formed by connecting and thereby integrating an installation/removal device and a card display change device together. The card installation/removal device is configured to have at a back side thereof a pressure reception wall, at a further back side of which a position adjustment mechanism part is provided. The position adjustment mechanism part is configured to include a seat member, a moving part, and a drive part. The position adjustment mechanism part is configured to strike and move the card installation/removal device by an eccentric cam. The position adjustment mechanism part moves the eccentric cam far from the pressure reception wall under the condition that a reaction force Fr received by the eccentric cam becomes larger than a force Fa for pulling the moving part toward the pressure reception wall side.