Sodium hydrogencarbonate crystal particles

A method for producing sodium hydrogencarbonate crystal particles having a low caking property, which comprises treating sodium hydrogencarbonate crystal particles having a mean particle diameter of from 50 to 500 μm (1) to lower the potassium concentration thereof to a level of at most 50 mass ppm and (2) to lower the carbonate ion concentration thereof to a level of at most 1 mass % which is the value converted from carbonate ion concentration to sodium carbonate concentration, wherein the potassium content in the sodium hydrogencarbonate crystal particles is lowered to a level of at most 50 mass ppm by rinsing the sodium hydrogencarbonate crystal particles with water or an aqueous solution containing sodium hydrogencarbonate, followed by drying.