VEHICULAR AIR CONDITIONING DEVICE

A vehicular air conditioning device (1) is provided with: a dust sensor (70) that detects the dust concentration of air flowing in an air conditioning duct (10); and a calculation unit (80) that calculates the average value of the dust concentration by averaging, on the basis of an average moving time, the dust concentration detected by the dust sensor. When the current dust concentration detectedby the dust sensor is higher than a predetermined threshold concentration, the calculation unit adjusts the average moving time to be shorter than the average moving time when the current dust concentration is equal to or lower than the threshold concentration. 车辆用空调装置(1)具备粉尘传感器(70)和运算部(80)，其中，该粉尘传感器(70)检测在空调管道(10)内流动的空气的粉尘浓度，该运算部(80)利用移动平均时间对由所述粉尘传感器检测出的粉尘浓度进行平均化，来运算所述粉尘浓度的平均值。在由所述粉尘传感器检测出的当前的粉尘浓度超过规定的阈值浓度的情况下，与所述当前的粉尘浓度为所述阈值浓度以下的情况相比，所述运算部使所述移动平均时间变短。