In this study, we focused on tatami. In this report, as the next study, we further improved the reduction of transmitted impact sound by the car-tire source and examined the case where the tatami mat thickness was reduced. As a result, we were able to realize a prototype tatami mat with a performance improvement of 4 dB by reducing heavy-weight floor impact sound level in 63 Hz band. The prototype tatami mats had a considerable impact mitigation effect of 27 to 32 G. It was suggested that it is effective to introduce the anti-vibration material into tatami.
