Measurements of ambient noise and vibration were carried out on a pile driving barge with a diesel pile hammmer.
　It becomes clear that a pile driving barge can be considered as a point sound source at a distance more than 70m away.
　The sound power level is 139-142 dB in A scale at the beginning of pileing. The sound level decreases as the penetration of pile increases.
　It is considered that the noise of the diesel pile hammer consists of blowing noise and exhaust noise, and that the proportion of these two noises changes with the penetration of pile.
　In this case, the measured value of the piling noise in the impulse' position is about 2 dB higher than that in the 'fast' position.
　The accelation of piling vibration decreases apploximately at the inverse square of the distance between the pile hammer and the measuring point like the sound intensity around a point sound source.