CONTAINER SECURING DEVICE

An object is to decrease a gap between a container-securing device and a corner casting. The device includes a flange 2 located on an outer side of a groove hole 151 of a corner casting 101a of a container 101; a support pillar 4 provided in the flange 2 for fitting into a mouth 151b of the groove hole 151; and a fitting portion 41 provided in the support pillar 4 for fitting into a hollow 151a of the groove hole 151. The fitting portion 41 is provided with a movable protrusion 43 which is pivotable on a horizontal shaft and is urged to protrude laterally out of a vertical surface portion of the support pillar 4. The flange 2 comes in contact with an outer surface region C of the corner casting 101a, and the movable protrusion 43 comes in contact with a far corner region D which is at a far end of the mouth 151b, for making a locked state.