A Lap-on-a-chip having filters and mixers

One embodiment of the present invention provides a lab-on-a-chip including a mixer that allows a filter with more than one liquid to remove air bubbles in the liquid flowing in the flow path to be mixed in the fine flow path (Lap on a chip). Lab-on-a-chip having a filter and a mixer in accordance with an embodiment of the present invention is that the channel in a predetermined shape is formed is provided on the channel portion, the channel portion to provide a flow path flowing the liquid in a direction perpendicular to the direction of flow of the flow path combined with a mixer, and the channel portion, and a filter in contact with the flow path.