[Subject] Non-invasive method for estimating blood pressure without a cuff and a device for the blood pressure estimation[Resolution means] Systolic blood pressure (EBP) is estimated according to EBP=β1·P1+β2·P2+β0 (β1, β2, and β0 are coefficients) where parameter P1, which is related to pulse transit time (PTT), and parameter P2, which is related to stroke volume based on pulse waves, are variables.