To provide a push-out mechanism capable of accurately pushing out an object to be pushed out.SOLUTION: A push-out mechanism for pushing out an object to be pushed out using the principle of leverage includes: a support part for supporting a holding sheet on which the object to be pushed out is held; and a push-out part for pushing out the object to be pushed out. The push-out part comprises: a shaft part; an arm that takes the shaft part as a fulcrum to rotate; and at least one button disposed on a side of the holding sheet of the arm. On the button are formed a first rib for pushing down the object to be pushed out and a second rib positioned at a position separated from the shaft part more than the first rib is separated from the shaft part. Rotating the arm makes the first rib and the...