Purpose: though the optical mouse for a laptop be arranged to realize very fast and correct movement when do not cause it is unnatural to muscle when one user using optical mouse for a long time. Construction: an internal part is embedded in a main body of laptop. Portion (20) are connected to internal part by the port formed on main body at one, carry out operation as a finger tip of placement to outside the one of main body. Portion of place (20) is moved toward a front/rear and a left/right direction by the muscle of a mobile finger, will not move a hand. The key entry of carriage return key input or an auxiliary is to be executed by it to press a switch cover (23a) by two finger-like. Portion of place (20) includes a shell (22) comprising a top and a pedestal (221,222), an optical sensor (23) and a switch (24).
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