Provided is a novel technique for providing a substrate advantageous when producing a sensor for analysis. The substrate for producing a sensor for analysis provided in the present disclosure has specific characteristics (for example, monodispersion, a single layer, or a specific density), such that it is possible to produce a sensor for analysis that is stable and enables highly accurate analysis. In the present disclosure, it is not required to remove excess fine particles after arranging the fine particles on the substrate, reproducibility of the density of the fine particles immobilized on the substrate is improved, and monodispersibility and single-layer properties are also improved.