A switch includes an insulative housing, a fixed contact, a movable contact and an actuator. The insulative housing defining a receiving cavity enclosed by a number of peripheral walls each of which includes an inner surface exposed to the receiving cavity. The actuator includes a bottom portion slidably received in the receiving cavity, a bottom operator for deforming of the moveable contact and a button. The bottom portion includes a first side wall and a first rib protruding sidewardly therefrom. The first rib is slidable against a first inner surface of the peripheral walls while the first side wall is separated a distance from the first inner surface. As a result, contacting areas of the actuator and corresponding inner surface are greatly reduced, and soldering materials, such as flux, originally influencing movement of the actuator can be avoided.