A system for measuring a pulse wave of a subject, comprising: a first sensor array and a second sensor array for respectively sensing a corresponding pulse wave of a first and a second artery of the subject when being placed on the skin of the subject above respectively the first artery and the second artery of the subject, each of the first sensor array and the second sensor array comprising a plurality of sensors for respectively acquiring a plurality of first signals indicating a vibration of the skin; a deriving unit configured to derive, for each of the first sensor array and the second sensor array, a second signal representing the corresponding pulse wave from the plurality of first signals; and a first calculating unit configured to calculate a pulse transit time between the first artery and the second artery from the second signal derived for the first sensor array and the second signal derived for the second sensor array; characterized in that: each of the plurality of sensors is configured to acquire the first signal indicating the vibration of the skin in at least two directions; wherein each of the plurality of sensors comprises a contact surface for contacting the skin of the subject; the at least two directions comprise an X-axis direction, which is a direction perpendicular to the contact surface; and the deriving unit is configured, for each of the first sensor array and the second sensor array, to select a first signal from the plurality of first signals, and to derive the second signal from the X-axis direction component of the selected first signal. a first sensor array and a second sensor array for respectively sensing a corresponding pulse wave of a first and a second artery of the subject when being placed on the skin of the subject above respectively the first artery and the second artery of the subject, each of the first sensor array and the second sensor array comprising a plurality of sensors for respectively acquiring a plurality of first signals indicating a vibration of the skin; a deriving unit configured to derive, for each of the first sensor array and the second sensor array, a second signal representing the corresponding pulse wave from the plurality of first signals; and a first calculating unit configured to calculate a pulse transit time between the first artery and the second artery from the second signal derived for the first sensor array and the second signal derived for the second sensor array; characterized in that: each of the plurality of sensors is configured to acquire the first signal indicating the vibration of the skin in at least two directions; wherein each of the plurality of sensors comprises a contact surface for contacting the skin of the subject; the at least two directions comprise an X-axis direction, which is a direction perpendicular to the contact surface; and the deriving unit is configured, for each of the first sensor array and the second sensor array, to select a first signal from the plurality of first signals, and to derive the second signal from the X-axis direction component of the selected first signal. each of the plurality of sensors is configured to acquire the first signal indicating the vibration of the skin in at least two directions; wherein each of the plurality of sensors comprises a contact surface for contacting the skin of the subject; the at least two directions comprise an X-axis direction, which is a direction perpendicular to the contact surface; and the deriving unit is configured, for each of the first sensor array and the second sensor array, to select a first signal from the plurality of first signals, and to derive the second signal from the X-axis direction component of the selected first signal.