Noticeably, preschool children develop language and communication, so improvement of the preschool’s sound environment is important. Recent Japanese preschool facilities have experienced problems with noise in the sound environment. One cause is a lack of sound absorption. Moreover, the loudness of the generated sound is a second cause as preschool teachers generally think that children’s voices should not be muted. Therefore, approaches from both the acoustic environment and people are needed to improve the sound environment. Meanwhile, in Germany it was specified in DIN 2004 that the proper conditions of sound absorption in nursery classrooms are superior to those of school classrooms; consequently, nursery rooms began to absorb sound (Kawai, et al., 2018). We researched the sound environment and preschool teacher’s thoughts about it at German preschools to identify how a comfortable sound environment is created. It was found that sound absorption of nursery classrooms has become established and preschool teachers’ awareness of the acoustic environments is high, and the generated sound tends to be low because teachers think children should learn to use a suitable voice level. Consequently, it was suggested that proper acoustic performance improves human awareness and leads to the creation of a better educational environment.