Forward/backward movement device

A forward/backward movement device, comprising:

• a case;
• a forward/backward movement member that includes one end and another end, moves forward in a direction from inside the case toward outside the case, and moves backward in a direction from outside the case toward inside the case, a side of the one end being housed in the case, a side of the other end protruding from the case;
• a biasing member that biases the forward/backward movement member;
• a movement member that is housed in the case and moves between a first position and a second position, the first position allowing the forward/backward movement member to move forward by a biasing force of the biasing member, the second position being a position in which the forward/backward movement member is stopped from moving forward;
• a to-be-engaged part that moves together with the forward/backward movement member inside the case;
• a pressing force transmitting member that moves from a forward position to a backward position by a pressing force when a lid is closed;
• and
• an engagement part that moves together with the pressing force transmitting member inside the case, wherein:
• when the forward/backward movement member moves forward, the engagement part and the to-be-engaged part are in an engaged state such that the biasing force of the biasing member is applied to the pressing force transmitting member, and
• when the pressing force transmitting member is positioned in the backward position, the engagement part and the to-be-engaged part are in a non-engaged state such that the biasing force of the biasing member is not applied to the pressing force transmitting member.