A balance ability measurement apparatus comprising: acquisition means for acquiring load information on weight of a user; load change information calculation means for calculating, based on the load information, load change information on change in the weight of the user; left-right displacement information calculation means for calculating, based on the load information, left-right displacement information on displacement of the user in left-right direction; and balance ability evaluation value calculation means for calculating, based on the load change information and the left-right displacement information, a balance ability evaluation value on balance ability of the user, and load sensors (30A, 30B, 30C, 30D), wherein the load information includes unit load data measured by each of the load sensors (30A, 30B, 30C, 30D), and total load data obtained by summing the unit load data and representing the weight of the user, characterized in that the balance ability measurement apparatus further comprises period calculation means for calculating, based on the load information, a period of a stand-up movement which is a period of time from when the user starts the stand-up movement from a chair to when the user stabilizes standing posture; the load change information calculation means calculates, based on the total load data, a representative value of an amount of change in the total load data of the user per unit time during the period of the stand-up movement as calculated by period calculation means, the left-right displacement information calculation means calculates, based on the unit load data, a representative value of an amount of change in the displacement of the user per unit time in the left-right direction during the period of the stand-up movement, and the balance ability evaluation value calculation means calculates the balance ability evaluation value based on: the representative value of the amount of change in the total load data of the user per unit time; and the representative value of the amount of change in the displacement of the user per unit time in the left-right direction. acquisition means for acquiring load information on weight of a user; load change information calculation means for calculating, based on the load information, load change information on change in the weight of the user; left-right displacement information calculation means for calculating, based on the load information, left-right displacement information on displacement of the user in left-right direction; and balance ability evaluation value calculation means for calculating, based on the load change information and the left-right displacement information, a balance ability evaluation value on balance ability of the user, and load sensors (30A, 30B, 30C, 30D), wherein the load information includes unit load data measured by each of the load sensors (30A, 30B, 30C, 30D), and total load data obtained by summing the unit load data and representing the weight of the user, characterized in that the balance ability measurement apparatus further comprises period calculation means for calculating, based on the load information, a period of a stand-up movement which is a period of time from when the user starts the stand-up movement from a chair to when the user stabilizes standing posture; the load change information calculation means calculates, based on the total load data, a representative value of an amount of change in the total load data of the user per unit time during the period of the stand-up movement as calculated by period calculation means, the left-right displacement information calculation means calculates, based on the unit load data, a representative value of an amount of change in the displacement of the user per unit time in the left-right direction during the period of the stand-up movement, and the balance ability evaluation value calculation means calculates the balance ability evaluation value based on: the representative value of the amount of change in the total load data of the user per unit time; and the representative value of the amount of change in the displacement of the user per unit time in the left-right direction. the representative value of the amount of change in the total load data of the user per unit time; and the representative value of the amount of change in the displacement of the user per unit time in the left-right direction.