CAULKING STRUCTURE, AND MECHANISM FOR PREVENTING ILLICIT OPENING OF BOARD CASE

PROBLEM TO BE SOLVED: To provide a caulking structure configured to prevent an engagement state from being released by an external operation, and a mechanism for preventing a board case from being illegally opened.SOLUTION: The caulking structure K is configured to connect a first caulking portion 210 provided on a first connecting member 201 to a second caulking portion 202 provided on a second connecting member 202 by mutually engaging them in a case 203. The first caulking portion 210 has first lock claws 211-213 aligned substantially in a line from one end side of the case 203 to the other end side, and the second caulking portion 220 has second lock claws 211-223 aligned substantially in a line from one end side of the case 203 to the other end side to be engaged with the first lock claws 211-213. The first lock claws 211-213 and the second lock claws 221-223 are configured so that when the first caulking portion 210 and the second caulking portion 220 are engaged with each other, the direction of disengaging the first lock claws 211-213 from the second lock claws 221-223 is alternated.