In this paper, a sensitive shoe for gait evaluation is described, in which hetero-core optical fiber sensors are embedded in the insole for detecting plantar pressure. The sensitive shoe can obtain important factors indicative of weight shift and foot rolling for gait evaluation by monitoring plantar pressure without constraint to walking. The hetero-core optical fiber sensor has been proposed to have many advantages which are high sensitivity to macro-bending, lightweight, independent on temperature fluctuations, and no electric contact. Gait of three subjects has been monitored who wear the sensitive shoe in walking on the treadmill. As a result, the proposed sensitive shoe could successfully detect different gait characteristics.