An apparatus and a method for noninvasive and caffless blood pressure measurement are provided. The apparatus includes: a photoplethysmography (PPG) amplitude calculation unit, a time difference calculation unit, a velocity calculation unit, and a calculation unit. The method includes the following steps: calculating amplitude differences between characteristic points of a PPG waveform calculating differences between a time point of a peak of an electrocardiography (ECG) waveform and a time point of each of the characteristic points of the PPG waveform calculating differences between time points of the characteristic points of the PPG waveform performing calculation according to the length of a hand and an ECG-PPG time difference to obtain a pulse wave velocity (PWV)and performing calculation according to the PWV, one of the characteristic point amplitude difference, and one of the characteristic point time difference to obtain a systolic/diastolic blood pressure estimate.
