To watertightly attach a hanger without troublesome work.

The hanger is provided with a locking ring 4A capable of hooking a hanging means 2a in a hanger main body 4 and a screw 4B to freely screw the hanger main body 4 to the hanging object 1. A first contact part 5A directly pushed against a hanger attaching part 3 associated with screwing the screw 4B to the hanger attaching part 3 is provided in a pushing part 5 opposite to the hanger attaching part 3 of the hanging object 1 around a screw 4B base end in the hanger main body 4. While the first contact part 5A is brought in contact with the hanger attaching part 3, a second contact part 5B is provided to hold an elastic seal ring R interposed in a contacted state clamped between the pushing part 5 and the hanger attaching part 3 throughout the entire periphery.