A first user operation unit includes a top surface and a first wall part extending downward from an outer side of the top surface. A press-down operation in the top surface allows the first user operation unit to move in a vertical direction. A holder supports the first user operation unit from below and includes a circuit board on a bottom surface of the holder. An outer wall part of the holder extends upward from an outer side of the circuit board and is provided outside the first wall part of the first user operation unit. Eaves of the first user operation unit extend outward from the first wall part and covers the outer wall part of the holder from above.

An electromagnetic relay includes a case defines an accommodating space, and a base defines the accommodating space together with the case. A coil is disposed in the accommodating space and generates electromagnetic force when energized. A pair of fixed contactors with one end disposed in the accommodating space and fixed to the base while the other end protrudes outside the accommodating space. The fixed contactors each have a fixed contact. A movable contactor is disposed in the accommodating space and driven by the electromagnetic force generated by the coil to make or break contact with the fixed contacts. The movable contactor includes a movable contact. An adsorbent is disposed within the accommodating space at a location different from a contact point between the fixed contact and the movable contact.