Abstract: In a cushion skin, left and right side surface skin front portions are fixed to a cushion frame of the seat cushion. The left and right side surface skin rear portions are respectively connected to the left and right side surface skin front portions, and each have a lower extending portion extending downward of the rear portion of the cushion pad. The connecting portion is disposed at the lower side of the rear portion of the cushion pad, and connects the distal end portions of each lower extending portion of the left and right side surface skin rear portions in the seat left-right direction. In each lower extending portion, a front side in the seat front-rear direction expands wider outward in the seat left-right direction than a rear side.

Abstract: A sensor unit is brought into contact with a surface of a living body to detect a pulse wave of an artery directly below. A CPU extracts a characteristic point of the pulse wave detected and obtains a second systolic component in the pulse wave using the characteristic point extracted. Then, a variation with time in a systolic blood pressure of a central artery of the living body is estimated using the second systolic component obtained, and an estimated variation with time in the systolic blood pressure is displayed on a display portion. For estimation of the systolic blood pressure, arithmetic with a linear transformation is applied using the second systolic component obtained and a blood pressure of a peripheral artery which is measured beforehand with an electronic sphygmomanometer.