An electronic device includes: a first housing 1; a cover 11 capable of covering a portion of the first housing 1 to be covered; and a waterproofing member 12 placed around the portion to be covered. The cover 11 is displaceable between a closed position at which the cover covers the portion to be covered and an open position at which the cover opens the portion to be covered. The cover 11 is in contact with the waterproofing member 12 when it is at the closed position. Even if the number of terminals increases, since the waterproofing member 12 is provided on the first housing 1, the single waterproofing member can render all of the terminals waterproof. Thus, it is possible to reduce the number of components and to reduce the number of assembling steps.