CEILING INSPECTION PORT

PROBLEM TO BE SOLVED: To provide a ceiling inspection port capable of being attached to a ceiling surface even when space in the vertical direction is narrow, having sufficient airtightness though in a simple structure, and improving durability.SOLUTION: In the ceiling inspection port including a rectangular outer frame 10 fixed to a ceiling opening 3 and a rectangular inner frame 20 pivoted through a turning mechanism interposed between end sides of two sides facing each other of the outer frame and provided with a lid material 8 inside, the outer frame includes a vertical piece 11, an upper flange part 12 extended inwards from the upper end of the vertical piece, and a downward inclined surface 14 formed at the distal end of the upper flange part, and the inner frame includes a vertical piece 21, an upper flange part 22 extended outwards from the upper end of the vertical piece, and an upward inclined surface 25 formed at the distal end of the upper flange part. The downward inclined surface of the outer frame and the upward inclined surface of the inner frame face each other in the state of closing the inner frame, and an airtight material 50 is interposed between the downward inclined surface and the upward inclined surface.