A lid opening-and-closing device that opens and closes an upper lid of a container, the container including: a container body; the upper lid; a locking mechanism that locks the upper lid onto the container body when the upper lid is mounted on the container body; and a strip provided to the upper lid, the device including: a placement platform on which the container is placed; a guide provided on both sides above the placement platform and comes into contact with a lower face of the strip to rotate the strip upward to an extent exceeding the predetermined value with respect to the container body when the container is inserted in the horizontal direction to a specified position of the placement platform; and a raising/lowering mechanism that moves the container body and the upper lid for which locking by the locking mechanism has been released, relatively in an up-and-down direction.