The purpose of the present invention is to provide: vinegar-containing cooked rice having sustained/retained sour taste a method for producing the vinegar-containing cooked rice a method for sustaining/retaining sour taste of vinegar-containing cooked rice and a seasoned vinegar having a property of sustaining/retaining sour taste of vinegar-containing cooked rice. Provided is vinegar-containing cooked rice characterized by containing a cold-water-soluble starch degradation product in an amount of 0.05 to 1 parts by mass relative to 1 part by mass of an acid containing in the vinegar-containing cooked rice.