PURPOSE: To provide a method and an equipment for surely recognizing a seal breaking of a joint capable of simply confirming the place of leakage from the sealing of the panel joint and the stone joint on a field.

CONSTITUTION: The seal breaking inspection device 10 of a joint with a surrounding body 1, which provides an air suction hole 3, an opening section 7 opened to at least one surface and a sealing medium 9 arranged to the periphery of the opening section and is formed so that the inside can be seen through, is used, the joint at a place to be inspected is coated previously with a soap solution, the periphery of the place to be inspected is surrounded by the surrounding body 1 and hermetically sealed and the inside of the body 1 is decompressed, and the presence or absence of the foaming of the applied soap solution are confirmed by eyes.