An air conditioner control device that is configured to control a plurality of air conditioners that are installed at different positions in a specified inhabited space; which comprises: a management unit that is configured to manage information related to people in spaces that are air conditioned by the respective air conditioners; a number-of-people-in-a-room calculation unit that is configured to calculate, for each air conditioner of the plurality of air conditioners, a number of people in a space that is air conditioned by an air conditioner based on the information related to people in the space that is managed by the management unit; characterized by further comprising: a control time determination unit that is configured to reduce or increase a control time during which energy-saving control of each air conditioner is executed according to a ratio obtained by performing, for all of the spaces, a subtraction process of subtracting a number of people correlated with each air conditioner from a total number of people in the specified inhabited space, adding together values obtained by the subtraction process to obtain a total of the values, and dividing one of the values obtained by the subtraction process by the total of the values, in such a manner that a total control time for the plurality of air conditioners is maintained to be a predetermined time; and a control execution unit that is configured to repeatedly execute energy-saving control for each air conditioner according to the control time that is reduced or increased by the control time determination unit. a management unit that is configured to manage information related to people in spaces that are air conditioned by the respective air conditioners; a number-of-people-in-a-room calculation unit that is configured to calculate, for each air conditioner of the plurality of air conditioners, a number of people in a space that is air conditioned by an air conditioner based on the information related to people in the space that is managed by the management unit; characterized by further comprising: a control time determination unit that is configured to reduce or increase a control time during which energy-saving control of each air conditioner is executed according to a ratio obtained by performing, for all of the spaces, a subtraction process of subtracting a number of people correlated with each air conditioner from a total number of people in the specified inhabited space, adding together values obtained by the subtraction process to obtain a total of the values, and dividing one of the values obtained by the subtraction process by the total of the values, in such a manner that a total control time for the plurality of air conditioners is maintained to be a predetermined time; and a control execution unit that is configured to repeatedly execute energy-saving control for each air conditioner according to the control time that is reduced or increased by the control time determination unit. a control time determination unit that is configured to reduce or increase a control time during which energy-saving control of each air conditioner is executed according to a ratio obtained by performing, for all of the spaces, a subtraction process of subtracting a number of people correlated with each air conditioner from a total number of people in the specified inhabited space, adding together values obtained by the subtraction process to obtain a total of the values, and dividing one of the values obtained by the subtraction process by the total of the values, in such a manner that a total control time for the plurality of air conditioners is maintained to be a predetermined time; and a control execution unit that is configured to repeatedly execute energy-saving control for each air conditioner according to the control time that is reduced or increased by the control time determination unit.