The present invention when increasing the working distance to the sample surface is measured in a micro lens microlens or the sample surface is contaminated or prevent damage, for which more possible to be measured the surface of the water measured at a high speed over a multi-domain parallel confocal It relates to the system. The present invention therefor includes a light source for irradiating light; The measured head to the water, or through which the reflected light from the measured object, and a relay lens unit comprising at least one lens for focusing a light irradiated from the light source; The relay lens microlens that the focused light is incident through the plurality of array forms is a microlens array, a multi-optical probe is focused on the water surface the light is to be measured through the microlens array; After reflected from the object to be measured, the micro lens and the relay lens photoelectric detector for detecting light incident through parts (photo detector); between the place jidoe, the focal length and the micro lens and the measured object of the microlenses include then determined by the distance focus and the focus of said relay lens it is characterized in that located in the same plane.