NOVELTY - A cell made of polymers for spectra measurement comprises a surface at least part of which is composed of a polymer chain comprising a functional group including oxygen and a functional group including the secondary or tertiary nitrogen.    USE - In spectra measurement for an automatic spectrum photometry apparatus (claimed) for medical diagnosis utilizing a biochemical and analytical reaction, an immune reaction.    ADVANTAGE - The cell made of polymers for spectra measurement inhibits a decrease in a molecular weight of resin caused by discharge treatment and have a stable hydrophilic modified surface; has excellent tolerance to a washing liquid containing an alkali or acid or chemical solution; has a surface that does not cause changes in hydrophilic properties with the elapse of time, which is considered to generally occur on a hydrophilic surface prepared via surface modification; has excellent chemical solution tolerance, it does not experience deteriorated hydrophilic properties caused by a washing liquid or lowered hydrophilic properties caused by storage; and can be used and stored for a long period of time. The cell made of polymers for spectra measurement inhibits changes in light transmission due to air bubble adsorption on the spectral measurement wall; and improves accuracy of the measurement data. Hydrophobic properties of the cell opening region can prevent wetting of a reagent or sample, which in turn prevents mutual pollution of samples between reaction cells and improves data reliability. Such effects also contribute to reduction of the amounts of samples and reagents and also contribute to reduction of the running cost of an automatic analysis apparatus.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) multiple cells made of polymers for spectra measurement composed of several cells made of polymers for spectra measurement connected to each other; and    (2) producing a cell made of polymers for spectra measurement having a surface at least part of which has been modified involving: (1) providing a cathode inside the cell made of polymers for spectra measurement and an anode outside the cell, so that the cathode and the anode face each other; (2) substituting the atmosphere in the cell with a nitrogen gas and generating corona discharge between the cathode and the anode; and (3) supplying oxygen-containing gas into the cell to expose the inside of the cell to the oxygen-containing gas atmosphere after the completion of the corona discharge treatment.