To provide an air-conditioning control system capable of properly computing heat load by heat energy generated indoors from a heat source having influence on an indoor temperature by a simple method.

This air-conditioning control system 1 comprises an indoor photographing means 2 disposed on a ceiling inside of a room 30 for picking up an indoor image, an indoor image recording portion 3 for recording the image picked-up by the indoor photographing means 2, an indoor movement determining portion 4 for determining the movement of a person indoors from the image recorded by the indoor image recording portion 3, a means 5 for estimating the number of persons staying in the room, an air-conditioning load computation portion 6 for computing the air-conditioning load of the room 30, and an air-conditioning equipment control portion 7 for controlling an outdoor unit 20, an indoor unit 21 and a conditioned-air blowout opening 22 on the basis of the air-conditioning load computed by the air-conditioning load computation portion 6.