To have no use for carrying different cards in every card lock by providing different opening rows to different side edge sections, respectively.

This card lock system is constituted of a card 3 having an opening row 310 arranging a plurality of openings 31, 31... on the side edge section of the card 3 and a card lock capable of being unlocked by inserting the side edge section having the opening row 310 of the card 3 from an insertion gap of the card lock. In that case, different opening rows 310 and 320 are provided respectively to the different side edge sections of the card 3, and it is constituted of the card 3 and a plurality of card locks capable of being unlocked by inserting the side edge sections having the different opening rows 310 and 320 of the card 3.