To easily assemble a cellular phone while maintaining a dust-proof function and to surely prevent positional deviation of a lens unit.

When the cellular phone 1 is assembled by fitting a front case 8 and a rear case 11 each other, a press cushioning member 14 is pressed by a pressing rib 8a formed on the inner surface of the front case 8, and the back of the lens unit 15 is pressed by the press cushioning member 14. Then, the periphery part of the edge surface 43a of a cylindrical part 43 is pressed against an annular wall surface 45a of a lens butting wall in a tight-contact state, so that dust is prevented from entering to the inner part of an upper housing 6 from the outside via the location of the lens unit 15, and also the positional deviation of the lens unit 15 is surely prevented.