An ultrafine ground tea dispersion characterized by being produced by grinding a tea raw material, obtaining a powdered tea from the ground product, subjecting the obtained powdered tea to further fine grinding and removing most of the particles of 1 .mu.m or more in diameter. The tea beverage produced by blending the ultrafine ground tea dispersion is high quality exhibiting minimized roughness and miscellaneous taste, retaining refreshing aftertaste indispensable for green tea beverage, having the original texture, body and flavor of green tea and being stable so as to be free from precipitation or turbidity even if stored for a prolonged period of time.