To provide a white light confocal optical measurement device capable of detecting abnormalities in a received light waveform. An optical measurement device according to one aspect of the invention includes a light source 10 configured to emit illumination light including a plurality of wavelength components; a sensor head 30 configured to introduce an axial chromatic aberration into the illumination light from the light source 10 and to receive reflection light reflecting from a measurement object 2 where at least a portion of the measurement object 2 lies along a line extending from the optical axis of the optical system; a light receiving unit 40 configured to separate the reflection light received at the sensor head 30 into wavelength components and thereby receive the light having the wavelength components; a light guide 20 configured to optically connect the light source 10, the light receiving unit 40, and the sensor head 30; and a processor 50 configured to compute the distance from the optical system to the measurement object 2 on the basis of a received light intensity of the wavelength components received in the light receiving unit 40. The processor 50 compares a received light intensity of a wavelength component to a reference value for the wavelength component for a plurality of wavelength components in a waveform representing the light received, and detects an abnormality in the received light waveform when the amount of change in the received light intensity compared to the reference value therefor is greater than or equal to a predetermined threshold for any wavelength component in the plurality of wavelength components.