Provided is a fluid path structure in which the flow rate of fluid flowing in each flow path is equal to each other and in which each flow path has an increased freedom in shape. The flow path structure has flow paths into which fluid is introduced. The flow paths include flow paths having different flow path lengths. The equivalent diameter of each part of each fluid path is set according to the flow path length of the fluid path so that the entire pressure loss of each flow path is equal to each other.