To obtain an exhalation analyzer whose operability is enhanced, whose time is shortened and which can make effective use of a carrier gas in a start-up and a fall operation.

In a start-up operation, a main control part 20 opens a solenoid valve 18, it starts to heat a detector heater 16H after the elapse of a definite time, it starts to heat a column heater 12H after the elapse of a definite time, it turns on an ionization lamp 14 after the elapse of a definite time, and it outputs a preparation completion signal when the slope sensitivity of a detector 16 becomes a definite value or lower. In a fall operation, the main control part 20 turns off the ionization lamp 14, it finishes heating the column heater 12H, it finishes heating the detector heater 16H after a definite time, and it closes the solenoid valve 18.