Disclosed is gluten having good dispersibility in water. Also disclosed is a method for producing active gluten, a gluten-containing food or a gluten gel efficiently by using a gluten dispersion solution. Further disclosed is a method for producing a gluten hydrolysate efficiently by preparing a gluten dispersion solution in a simple manner and hydrolyzing the dispersion solution. Gluten, which normally forms an aggregate in water, can be dispersed readily by mixing gluten with a water-soluble polysaccharide containing galacturonic acid. The gluten dispersion solution thus prepared can be used to produce active gluten, a gluten-containing food or a gluten gel efficiently, and can be also used to prepare a gluten hydrolysate in a simple manner, efficiently and stably.