A finger-touch sensor for an exercise apparatus, comprising at least a detection recess formed at a handrail (or a swing arm) of the exercise apparatus for insertion of a human finger. At least one block-out short-wave sensor having an emitter and a corresponding receiver is fitted to the detection recess. The block-out short-wave sensor is coupled through a wire transmission line to an electronic console of the exercise apparatus such that an actual detection message obtained by the block-out short-wave sensor may conduct a pre-determined action by use of a built-in microprocessor. In this way, an easy control and adjustment of all factors (such as the exercise speed, slope or resistance, etc.) of the exercise apparatus is ensured by placing the human finger into the detection recess for blocking the emitting or reflecting signal.