To provide a link mechanism for correcting backlash.

The link mechanism is equipped with a shutter speed switching lever 39 switching shutter speed by inserting/pulling out a pad 45 in/from the rocking locus of a shutter blade 31, and a projecting piece 44 provided integrally with the lever 39, and then the piece 44 is constituted to be held between two crimping pins 50b and 50c of a switching ring 50. When the ring 50 is turned, either pin 50b or 50c presses the piece 44 so as to rock the lever 39. Furthermore, a notch 44a is formed at the part of the piece 44 on which the pin 50c abuts, whereby the piece 44 and the pin 50c stably abut on each other, and the backlash is prevented from occurring between the lever 39 and the ring 50.