The maximum cross-correlation coefficient (ρ_max) between blood pressure (BP) and heart rate (HR) variability for frequency components limited to the Mayer wave-related band is useful for the evaluation of baroreflex function. However, continuous BP measurement with an expensive and bulky measuring device is required to calculateρ_max. This study proposes a simpler method to obtain ρ_max using a green light photoplethysmogram (PPG). A green PPG sensor is less affected by motion artifacts than a near-infrared PPG sensor. In this study, an electrocardiogram, continuous BP, green PPG, and near-infrared PPG were obtained from the subjects. HR, mean BP, and pulse transit time were estimated from the signals, and ρ_max was subsequently calculated. Compared to the ρ_max obtained from the near-infrared PPG signal, the ρ_max obtained from the green PPG signal is closer in value to the ρ_max obtained from mean BP. These results show that the green PPG sensor can be used to estimate baroreflex function instead of using continuous BP measurement.