To provide a sealing member easily enhanced in sealing performance without requiring much labor, and also enhanced in heat radiation performance of the distribution board main body, neither being influenced by the deformation of the distribution board main body, nor increasing a projection amount from the wall surface, and also enabling sealing measures even in a distribution board having no lid on the front surface of the distribution board main body.

The sealing member 1 comprises: a main body part 5 for sealing a wiring hole 4 formed on a wall surface 3; and a collar part 6 formed on the front end edge of the main body part 5, both formed of resin material. A plurality of connection terminals 7 with a connection terminal structure for connecting both side electric wires on outside and inside of the wall to the main body part 5 are provided so that insertion holes 7a are arranged in one horizontally line. Then, the electric wires 8 are connected to the connection terminals 7 on the rear surface side of the sealing member 1, and the collar part 6 is fitted into the wiring hole 4 so as to abut on the wall surface 3 to seal the wiring hole 4. Then, one end of the electric wire 8 is connected to the connection terminal 7 on the front side, and the other end of the electric wire is connected to the branch breaker of the distribution board 2 to perform wiring.