A fluid control device for mixing liquids, includes at least: a monolithic base body; and a plurality of micro holes disposed in the base body. Also, the micro holes in a flow channel group α that configures a specific group have opening portions in a region A and a region B on surfaces being outer surfaces of the base body, the micro holes in a flow channel group β (n) that configures the other specific group have opening portions in the region A and a region C (n) on the surfaces being outer surfaces of the base body, and in the base body, the micro holes are disposed apart from the micro holes belonging to the different flow channel group throughout entire lengths. Here, the n refers to a natural number.