A cross-sectional study on pitch discrimination abilities of 4 and 5 years old children and elementary school from first to sixth grade students was conducted. The following results were obtained: (1) 5 years old children had more accurate pitch discrimination abilities than 4 years old children. Third grade students had more accurate pitch discrimination abilities than second grade students. Fourth grade students had more accurate pitch discrimination abilities than third grade students. The infants and the elementary school students who had met private musical instruction had more accurate pitch discrimination abilities than the infants and the elementary school students who had met no private musical instruction. (2) The narrower the differences between two pitches were, the more incorrectly infants determined whether the two pitches were same or different. When first pitch was minor third lower than second pitch, elementary school students except sixth grade students determined which pitch was higher or lower more correctly than when first pitch was major third higher than second pitch. When first pitch was minor second lower than second pitch, elementary school students except third and fourth grade students determined which pitch was higher or lower more correctly than when first pitch was major second higher than second pitch. (3) Regarding infants and elementary school students with inaccurate pitch discrimination abilities, there were many infants and elementary school students with inaccurate vocal pitch matching skills.