A print head formed in a simplified and less costly manufacture process can be effective in preventing the peeling-off between a substrate and a flow passage forming member. The inventive plastic PCR chip can perform a PCR even with a small amount of a sample through a reduction in the size of a PCR chamber included in the chip, compared to the prior PCR chip. A three-dimensional nonlinear color gamut converting unit performs conversion on tristimulus values of the XYZ signal.