An abnormality diagnostic device for a rolling bearing, comprising: a vibration sensor for measuring a vibration waveform of the rolling bearing; and a processing unit (80, 80A-80C) for diagnosing an abnormality of said rolling bearing, said processing unit including a first operation unit configured to calculate an effective value of said vibration waveform measured by using said vibration sensor, an envelope processing unit (140, 140A) configured to generate an envelope waveform of said vibration waveform by performing envelope processing on said vibration waveform measured by using said vibration sensor, characterised in that, said processing unit is further including a high pass filter configured to extract an AC component of said envelope waveform with a frequency above a predetermined frequency and for removing a DC component from said envelope waveform, a second operation unit configured to calculate an effective value of said AC component of said envelope waveform generated by said envelope processing unit, and a diagnostic unit (190, 190A) configured to diagnose the abnormality of said rolling bearing based on the effective value of said vibration waveform calculated by said first operation unit and the effective value of the AC component of said envelope waveform calculated by said second operation unit. a vibration sensor for measuring a vibration waveform of the rolling bearing; and a processing unit (80, 80A-80C) for diagnosing an abnormality of said rolling bearing, said processing unit including a first operation unit configured to calculate an effective value of said vibration waveform measured by using said vibration sensor, an envelope processing unit (140, 140A) configured to generate an envelope waveform of said vibration waveform by performing envelope processing on said vibration waveform measured by using said vibration sensor, characterised in that, said processing unit is further including a high pass filter configured to extract an AC component of said envelope waveform with a frequency above a predetermined frequency and for removing a DC component from said envelope waveform, a second operation unit configured to calculate an effective value of said AC component of said envelope waveform generated by said envelope processing unit, and a diagnostic unit (190, 190A) configured to diagnose the abnormality of said rolling bearing based on the effective value of said vibration waveform calculated by said first operation unit and the effective value of the AC component of said envelope waveform calculated by said second operation unit. a first operation unit configured to calculate an effective value of said vibration waveform measured by using said vibration sensor, an envelope processing unit (140, 140A) configured to generate an envelope waveform of said vibration waveform by performing envelope processing on said vibration waveform measured by using said vibration sensor, a high pass filter configured to extract an AC component of said envelope waveform with a frequency above a predetermined frequency and for removing a DC component from said envelope waveform, a second operation unit configured to calculate an effective value of said AC component of said envelope waveform generated by said envelope processing unit, and a diagnostic unit (190, 190A) configured to diagnose the abnormality of said rolling bearing based on the effective value of said vibration waveform calculated by said first operation unit and the effective value of the AC component of said envelope waveform calculated by said second operation unit.