A power switch includes an operating button, an elastic member, a printed circuit board, a support member, and a fixing module. The operating button includes a connecting portion. The elastic member includes a fixing portion and an elastic portion. The printed circuit board includes a main body and a contacting element. The support member includes a base portion and a receiving portion perpendicularly extending from the base portion, and the base portion defines a hole communicating with the receiving portion. The fixing module includes a cover and a contacting member formed on the cover. The connecting portion of the operating button is fixed to the main body and is received in the hole of the support member and the receiving portion. The fixing portion of the elastic member is sandwiched between the connecting portion of the operating button and the main body.