The invention disclsoes an environment management device (10), which is used to control motion statuses of a ventilation device (31) used for the indoor-outdoor ventilation to change the indoor air quality, an air purifier (32) and an air conditioner (33)used for improving the indoor air quality without the ventilation. The environment management device (10) is provided with an air quality acquisition part (13), an indication part (14), a management processing part (15), and an evaluation part (16). The air quality acquisition part (13) can be used to acquire the indoor and outdoor air quality measurement data from an air quality sensor (21). When the management processing part (15) rates the indoor quality as adverse, when the outdoor air quality is better than the indoor air quality, the ventilation device (31) can be started, and when the indoor air quality is better than the outdoor air quality, at least one of the air purifier (32) and the air conditioner (33) is started.