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.