The present invention relates to an image forming apparatus including an operation portion and a locking portion which are detachably mounted, wherein the operation portion is provided at a portion which is not the rim of the suitcase, the locking portion is provided at the rim of the suitcase, the locking portion includes at least one locking unit, The locking portion transmits a force through a force transmitting mechanism connected between the operating portion and the locking portion. The operating portion includes an operating member. The locking unit includes a locking head and a locking hook. A locking set is provided which is mounted on a non-zipper opening-closing suitcase for realizing locking or unlocking of a locking set by moving a locking head or a locking hook.
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