A pulse wave measuring device includes a processor and a memory. The processor obtains a visible light image, in a visible light wavelength range, of a user irradiated with visible light by a visible light source, obtains an infrared light image, in an infrared light wavelength range, of the user irradiated with infrared light by an infrared light source, extracts a visible light wave indicative of a user's pulse wave from the visible light image, extracts an infrared light wave indicative of a user's pulse wave from the infrared light image, computes a correlation value between the visible and infrared light waves, supplies a control signal for controlling the amount of infrared light emitted from the infrared light source to the infrared light source in accordance with the correlation value, calculates biological information by using at least one of the visible and infrared light waves, and outputs the biological information.
