There is provided a biological gas measurement device that continuously collects biological gas, and is able to immediately and chronologically measure a target substance from the collected biological gas. A skin gas measurement device includes a biological gas collector 10 having an aperture portion 11 in a side thereof that faces a living body, and having a recessed portion 12 that is connected with the aperture portion 11 and serves as a space for collecting biological gas, a measurement device 100 that measures a target substance in the biological gas collected by the biological gas collector 10, an outflow path 40 through which collected biological gas is discharged from the recessed portion 12 to the measurement device 100, and a correction device 124 that corrects measurements of the target substance performed by the measurement device 100, and enables measurement results of the target substance from which effects of moisture present inside the outflow path 40 have been excluded to be output.