Reagent for measuring amylase activity and measuring method thereof

Disclosed is a reagent for measuring amylase activity in body fluids by cleaving an oligosaccharide having a defined chain length with amylase in body fluids to produce a glucose and measuring said glucose, characterized in that the reagent is divided to two portions, the first portion comprises an enzyme for converting a glucose and/or maltose naturally present in body fluids to glucose-6-phosphate, phosphoglucose isomerase, phosphofructokinase and adenosine-5'-triphosphate, and the second portion comprises said oligosaccharide being used as a substrate and a phosphoric acid ester of saccharides and/or saccharic acids; and a method for measuring amylase activity in body fluids comprising; eliminating glucose and/or maltose naturally present in body fluids with a first reagent comprising an enzyme for converting the glucose and/or maltose to glucose-6-phosphate, phosphoglucose isomerase, phosphofructokinase and adenosine-5'-triphosphate, adding a second reagent comprising a oligosaccharide substrate and a phosphoric acid ester of saccharides and/or saccharic acids to eliminate the phosphoglucose isomerase activity and to convert the oligosaccharide fragments formed by the action of amylase in body fluids to glucose by means of alpha-glucosidase or maltose phosphorylase, and measuring the amount of the obtained glucose.