A measurement cell for analyzer for carrying out qualitative and/or quantitative analysis for one or more substances by an optical means, which is planar and has sample-holding portions, the contact angle between said sample-holding portion and water being 30° or less, and the contact angle between the other portion of said plane and water being 100° or more, permits a plurality of measurements with a single cell for the same one sample, repeated use and reduction of the amount of sample than before.