A medical input device according to the present invention is a medical input device that accepts an input of an instruction signal, and includes a main body portion that forms a housing, a trackball that partially protrudes from the main body portion, and is rotatably provided； A moving member having an inclined surface on which the ball can ride and movable in a direction approaching or moving away from the trackball, and an opening forming member capable of forming at least an opening smaller than the diameter of the trackball . 本発明に係る医療用入力装置は、指示信号の入力を受け付ける医療用入力装置であって、筐体をなす本体部と、本体部から一部が突出し、回転自在に設けられるトラックボールと、トラックボールが乗り上げ可能な傾斜面を有し、トラックボールに対して近づく方向、または遠ざかる方向に移動可能な移動部材と、トラックボールの径より小さい開口を少なくとも形成可能な開口形成部材と、を備えた。
