A MEMS switch in which contact force sufficient to make a contact having low contact resistance is maintained after contact-formation to maintain low contact resistance at the contact where the signal is transmitted in an “on” state. The MEMS switch includes a first electrode, a second electrode opposed to and separated from the first electrode, a third and a fourth electrodes, wherein electrical contact is made between the electrodes by electrostatic force generated between the electrodes, and a bump which can form the contact between the electrodes is provided on an electrode, and a gap is formed between the electrodes when the electrical contact is made between the electrodes.