An imaging apparatus includes sensor arrays each having a plurality of subarrays having a plurality of sensors which output signals based on radiation or light, and a plurality of temperature sensors which output signals based on temperatures of the sensor arrays. In this case, a signal output from one subarray of the plurality of subarrays and a signal of one temperature sensor of the plurality of temperature sensors are read out through a line to which the sensor included in the one subarray and the one temperature sensor are commonly connected.