Gel having biosubstance fixed thereto and microarray utilizing the gel

A method for detecting a target to be measured, which comprises

• reacting an analyte with a biological substance-immobilized gel microarray which comprises a biological substance-immobilized gel which comprises a gel containing 2%-7% by mass of N,N-dimethylacrylamide and a biological substance immobilized on and/or in the gel, wherein the gel is arranged in multiple compartments;
• and
• detecting the target in the analyte based on uniform fluorescence in the gel,
• wherein the gel comprises a cross-linking agent in an amount of 0.1% to 1.5% by mass.