Provided are an oxynitride piezoelectric material which exhibits ferroelectricity and has good piezoelectric properties and a method of producing the oxynitride piezoelectric material. The oxynitride piezoelectric material includes a tetragonal perovskite-type oxynitride represented by the following general formula (1): A1-xBix+δ1B1-yB′y+δ2O3-zNz  (1) where A represents a divalent element, B and B′ each represent a tetravalent element, x represents a numerical value of 0.35 or more to 0.6 or less, y represents a numerical value of 0.35 or more to 0.6 or less, z represents a numerical value of 0.35 or more to 0.6 or less, and δ1 and δ2 each represent a numerical value of −0.2 or more to 0.2 or less, in which the A includes at least one kind selected from Ba, Sr, and Ca and the B and the B′ each include at least one kind selected from Ti, Zr, Hf, Si, Ge, and Sn.