A rolling-ball switch includes a housing defining at least two receiving sections, at least one separating member provided in the housing between the two receiving sections, at least two conductive balls disposed rollably and respectively in the receiving sections, a pair of first terminals extending into one of the receiving sections to contact one of the conductive balls, and a pair of second terminals extending into the other one of the receiving sections to contact the other one of the conductive balls. The conductive balls are rollable toward the respective pairs of the first and second terminals in a first direction. The separating member prevents movement of the conductive balls from one of the receiving sections to the other one of the receiving sections.