(57) [summary] [purpose] The present invention is easily and quickly in the container box, which can attach and detach the card into the container box card holding structure holds the cards and the like in a container box without using a separate fixing member and the container box It is intended to provide. [Configuration] side plates of the container box (10) (12) The central portion of the rectangular recess (14) is formed. The first locking portion (30) is formed in the first wall of the recess (14) (16). The first gap portions (32) is formed between the bottom of the tip and the recessed portion of the first engagement portion (30) (14) (24). The second locking portion is in the second wall portion (18) (36) are projected facing the first wall portion (16). The second gap (38) is formed between the second engaging portion (36) and said bottom (24). Arcuate R-shaped portion (36A) is formed at the lower portion of the front end portion of said second engaging portion (36).
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