A mouse, including a shell which comprises a light-transmissive region disposed on a seamed edge where an outer side wall of the shell is intersected with a bottom surface of the shell, a lens configured to aggregate reflected light projected from the light-transmissive region on the working surface and transmit the reflected light to an image sensing element; an inner side of the rear part of the shell is provided with a notch configured to receive a thenar eminence part which protrudes downwards from the palm when the outer side of the shell is placed on the working surface to slide so as to sense the movement state of the cursor, such that the technical problem that a cursor movement is interrupted, frame loss occurs, keys and scroll wheels cannot be operated coherently due to switching of postures of hand is solved.