A mouse apparatus includes a mouse body, at least one operation portion, a slide cover, and a switch portion. The mouse body includes a built-in battery. The operation portion is provided on the mouse body. The slide cover is movable with respect to the mouse body between a first position that disables an operation by blocking the operation portion and a second position that enables an operation to be made by exposing the operation portion. The switch portion turns off power supply from the battery when the slide cover is at the first position and turns on the power supply from the battery when the slide cover is at least at the second position.
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