It is important to comprehend the characteristics of the noise occurring from combine harvesters in order to reduce the noise. In this study, estimation of noise at the operator’s head, the measurement of noise distribution, and the spectrum analysis of noise at the operator’s head were performed. As a result, at the operator’s head, A-weighted sound pressure level was 87dB(A) in the time domain, and A-weighted sound pressure levels at 160Hz and 330Hz were 72dB (A) and 71dB (A) in the frequency domain. So the operator feels uncomfortable in this working environment. It was found through the measurement of noise distribution that many noise sources and forms of parts constituting a combine harvester characterized the distribution and levels of the noise occurring from a stationary combine harvester. It was found through the spectrum analysis of the noise at the operator’s head that the engine exhaust would characterize the frequencies of the spectrum peaks of the noise at the operator’s head.
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