An optical measurement device including a light emitting element, a light pattern generating element and a light source transmission element is provided. The light pattern generating element includes a disk body, at least one round hole penetrating the disk body, at least one round disk embedded in the round hole, and at least two first magnetic elements disposed on the round disk. One end of the light source transmission element has two second magnetic elements. Through the magnetic connection of the first magnetic elements and the second magnetic elements, a chink on the round disk can rotate with the light source transmission element when the light source transmission element rotates. An optical measurement system including the optical measurement device is also provided.
