To prevent a tray positioned at an open position for work from being pushed and moved carelessly in an optical fiber connection box in which a plurality of trays, in each of which an optical fiber connecting and branching mechanism is mounted are inserted and attached in a storage case so as to be inserted and drawn out in a drawer type via a slide rail mechanism.

When the tray 4 is pushed and returned to move from the open position (b) for work toward a storage position (a), the tray 4 is equipped with resistive means which give resistance to the movement. For example, structure configured so that flexible rods 8, each of which performs sliding expansion and contraction with resistance are constructed over a storage case side to the tray is used as resistive means.