A physical quantity detection device that can improve arithmetic resolution while preventing an increase in memory capacity is obtained. A physical quantity detection device 100 according to the present invention includes: a physical quantity detection sensor that detects a physical quantity of a measurement target gas; a storage unit that records a correction amount corresponding to a detection value of the physical quantity detection sensor; and an arithmetic unit 110 that performs output adjustment of the detection value using the detection value and the correction amount. Resolution of the storage unit 120 is lower than arithmetic resolution of the arithmetic unit 110.