A mechanism for inverting a circular plate-shaped member, the mechanism comprising: a tubular body having a seating section therein; a circular plate-shaped member seatable on the seating section of the tubular body; a pair of support shafts (3, 4) supporting the circular plate-shaped member on both sides of the circular plate-shaped member; and a driving unit (9, 10, 11) configured to drive and rotate at least one of the pair of support shafts (3, 4), wherein as the at least one of the pair of support shafts (3, 4) is rotated by the driving unit, the circular plate-shaped member is inverted so as to make a predetermined angle with an axial direction of the tubular body, wherein support shaft moving means including decentered shafts (5, 6) in which the support shafts (3, 4) are respectively inserted in a decentered state and which decentered shafts (5, 6) are rotatably supported by the tubular body is provided, the support shaft moving means configured to move each of the support shafts (3, 4) in the axial direction of the tubular body is provided, when the circular plate-shaped member is seated on or removed from the seating section, the circular plate-shaped member is moved in the axial direction of the tubular body in a posture orthogonal to the axial direction of the tubular body as each support shaft (3, 4) is moved by the support shaft moving means and the driving unit (9, 10, 11) includes a drive shaft which is driven and rotated, the drive shaft being able to rotate the support shaft (3, 4) in a state that the support shaft (3, 4) and the drive shaft are concentrical with each other via a coupling section when the circular plate-shaped member is far from the seating section, the coupling section further allows the movement of the support shaft (3, 4) with respect to the drive shaft when the circular plate-shaped member is seated on or removed from the seating section. a tubular body having a seating section therein; a circular plate-shaped member seatable on the seating section of the tubular body; a pair of support shafts (3, 4) supporting the circular plate-shaped member on both sides of the circular plate-shaped member; and a driving unit (9, 10, 11) configured to drive and rotate at least one of the pair of support shafts (3, 4), wherein as the at least one of the pair of support shafts (3, 4) is rotated by the driving unit, the circular plate-shaped member is inverted so as to make a predetermined angle with an axial direction of the tubular body, wherein support shaft moving means including decentered shafts (5, 6) in which the support shafts (3, 4) are respectively inserted in a decentered state and which decentered shafts (5, 6) are rotatably supported by the tubular body is provided, the support shaft moving means configured to move each of the support shafts (3, 4) in the axial direction of the tubular body is provided, when the circular plate-shaped member is seated on or removed from the seating section, the circular plate-shaped member is moved in the axial direction of the tubular body in a posture orthogonal to the axial direction of the tubular body as each support shaft (3, 4) is moved by the support shaft moving means and the driving unit (9, 10, 11) includes a drive shaft which is driven and rotated, the drive shaft being able to rotate the support shaft (3, 4) in a state that the support shaft (3, 4) and the drive shaft are concentrical with each other via a coupling section when the circular plate-shaped member is far from the seating section, the coupling section further allows the movement of the support shaft (3, 4) with respect to the drive shaft when the circular plate-shaped member is seated on or removed from the seating section.